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: Radiology
[{'content': 'Osseous metastasis is most common if tumor is in: \nSelect and explain. \nA. Bronchus, B. Colon, C. Pancreas, D. Adrenal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Bronchus', 'role': 'assistant'}]