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
[{'content': '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: \nSelect and explain. \nA. Iris vessels, B. Circulus iridis major, C. Circulus iridis minor, D. Sho posterior ciliary vessels', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]