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 malignant eyelid tumor \nSelect and explain. \nA. Squamous cell CA, B. Basal cell CA, C. Sebaceous CA, D. Malignant melanoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Basal cell CA', 'role': 'assistant'}]