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 malignant tumor of the eyelids is \nSelect and explain. \nA. Squamous cell carcinoma, B. Basal cell carcinoma, C. Melanoma, D. Adenocarcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Basal cell carcinoma', 'role': 'assistant'}]