Q:

Why is this short answer deleted though it is answering accurately?

When I was looking at some deleted answers, I found out a deleted answer (2kers only). The answer was just a one word but it still answered accurately. There were upvotes on the answer and downvotes too. There were comments saying it is correct and accurate. At the same time, I noticed that there was a comment by a moderator talking about the answer quality.

Onliner answer doesn't considered here. Extend it into good answer by addidng explanation and then flag to undelete. 

What is a good answer here? According to SE, a good answer is an answer with 25 votes and we are awarded a badge. A good answer, bad answer is subjective. There were users who praised the answer to be right in the comments and upvoted too. Whose opinion was considered while judging good or bad answer while judging?
Are we defining good and bad with the length of the answer? Does quoting long passages from external sources make it a good answer? 
That answer addressed the question accurately yet it was deleted. Why is it deleted? 
The reason given is other answer is already covering Bhagavad Gita but this was the first answer to be posted to the question and other answer was posted 2 hours ago. If copied content is the reason, the other answer should be deleted. Right? This was deleted showing the answer posted very much later.
What is the correct reason for deleting answer even though it was answering the question accurately?

A:

Update: The answer has been revised/improved by others and now it's un-deleted.

Reason for deletion
The answer was of very low quality. The length of answer is not meeting the minimum length criteria and answerer tried to fool the system by adding dots!
Secondly, it may be worthy to convert it into comment if there's no reply to the post but other answers have already covered it. So, it wasn't adding any value either.
The relevant banner was also added to notify the answerer.
Though the comment added (quoted in question) may not be effective, anyway, such an answer is not acceptable.

A:

.........it's self-explanatory.........
(Imagine if that was the only "explanation" I chose to give in my answer.)
Questions that can be answered in just one or two lines, still need to provide sufficient explanation to make the cut (see What to do with those type of questions whose answers are simple yes or no?). So, yes, on this site, it's not just the votes that determine the quality of an answer. Length is equally important.
Here are other equally short "answers" that should qualify if "...Bhagavad Gita..." type were allowed:

.....Anugītā.....
.....Sānatsujātiya.....

Users are expected to provide at least a link to the summary of topic in Wikipedia or write one in their own words. We need to remember that answers are primarily written with OP as the reader, in mind. It's possible here that OP doesn't know that Bhagavad-gītā is an integral part of the Mahābhārata, so you should at least tell them the parva of MBH where BG occurs and the relevant chapter numbers. This was missing in the answer that was deleted.

