This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: Orthopaedics
[{'content': 'Tumour most commonly metastasizing to bone in females is \nSelect and explain. \nA. Carcinoma lung, B. Carcinoma breast, C. Carcinoma thyroid, D. Carcinoma ovary', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Metastatic tumours in the bone are commoner than the primary bone tumours. The tumours most commonly metastasizing to bone are carcinoma of the lung in the male and carcinoma of the breast in the female. Other malignancies metastasizing to the bone are carcinoma of prostate, carcinoma of thyroid etc. Reference: Maheshwari; Essential Ohopaedics; Page no: 246', 'role': 'assistant'}]