This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of orbit, Lids and lacrimal apparatus, Subject name: Ophthalmology
[{'content': 'Most common cause of trichiasis is- \nSelect and explain. \nA. Stye, B. Trachoma, C. Blephritis, D. Congenital', 'role': 'user'}, {'content': 'Answer: B \nExplanation: *The Most common among these are trachoma, Steven-Johnson syndrome, and trauma Ref: Textbook of Clinical ophthalmology 21st/e p.319', 'role': 'assistant'}]