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': 'The most common site of basal cell carcinoma of the lids is: \nSelect and explain. \nA. Upper lid, B. Lower lid, C. Medial canthus, D. Lateral canthus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Lower lid', 'role': 'assistant'}]