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: Social & Preventive Medicine
[{'content': '“Field carcinogenesis” is seen in \nSelect and explain. \nA. Breast carcinoma, B. Colon carcinoma, C. Brain tumour, D. Head and neck carcinoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]