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: Ophthalmology
An 18 year old boy comes to the eye casuality with history of injury with a tennis ball. On examination there is no perforation but there is hyphaema. The most likely source of the blood is: 
Select and explain. 
A. Iris vessels, B. Circulus iridis major, C. Circulus iridis minor, D. Sho posterior ciliary vessels
B: Circulus iridis major
Answer: B: Circulus iridis major 
Explanation: Traumatic hyphaema (blood in the anterior chamber) occurs due to injury to the iris or ciliary body vessels. The circulus iridis major gives off branches to the ciliary processes. Ref:Comprehensive Ophthalmology By AK Khurana, 4th Edition, Page 404