This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
The costalcailages of these ribs do not reach the sternum - 
Select and explain. 
A. 11th& l2th, B. 1st& 2nd, C. 6th& 7th, D. 8th, 9th& 10th
D: 8th, 9th& 10th
Answer: D: 8th, 9th& 10th 
Explanation: Ans. is'd'i.e., 8th, 9th& 10thRibsThere are 12 pairs of ribs.All aiculate posteriorly with thoracic veebrae.The ribs are divided into two types.True ribs or veebrosternal ribs :- These are 1st to 7th ribs which aiculate directly with sternum through costal cailages.False ribs :- These are 8th to 12th ribs and do not aiculate directly with sternum.False ribs can be divided into:Veebrochantral ribs:- 8th, 9th and 10th ribs whose costal cailages aiculate with each other and with 7th costal cailage forming costal marginFloating ribs veebral ribs :- 11th and 12th ribs have free anterior ends