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: Skin
[{'content': 'Actinic keratosis is seen in : \nSelect and explain. \nA. Basal cell carcinoma, B. Squamous cell carcinoma, C. Malignant melanoma, D. Epithelial cell carcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Squamous Cell Carcinoma', 'role': 'assistant'}]