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: Medicine
[{'content': 'Smoking predisposes to carcinoma of  a) Bladder  b) Ovary  c) Buccal mucosa  d) Breast  e) Stomach \nSelect and explain. \nA. ace, B. acd, C. abd, D. ac', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]