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': 'Carcinomas of all of following sites metastasize to vertebral column except - \nSelect and explain. \nA. Breast, B. Bronchus, C. Prostate, D. Esophagus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]