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': 'Most common tumour of eye lid: \nSelect and explain. \nA. Lacrimal gland tumour, B. Basal cell carcinoma, C. Squamous cell carcinoma, D. Maligant melanoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Basal cell carcinoma', 'role': 'assistant'}]