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': 'Commonest tumor of lid is \nSelect and explain. \nA. Adenocarcinoma, B. Malignant melanoma, C. Squamous cell carcinoma, D. Basal cell carcinoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Basal cell carcinoma', 'role': 'assistant'}]