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: Pathology
[{'content': 'Keratin is a tumour market for - \nSelect and explain. \nA. Carcinoma cervix, B. Neurofibroma, C. Rhabdomyosarcoma, D. Chorio carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]