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: Surgery
[{'content': 'Bony metastasis is common with all of the following except - \nSelect and explain. \nA. Ca breast, B. Ca lung, C. Ca testis, D. Ca prostate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans is \'c\' i.e., Ca Testis "Bone is a common site of metastasis for carcinomas of the prostate, breast, lung, kidney, bladder and thyroid and for lymphomas and sarcomas. Prostate, breast and lung primaries account for 80% of all bones metastasis." - Harrison Testicular Ca metastasis to bones is very rare (not even mentioned in Harrison\'s detailed explanation of Testicular carcinoma)', 'role': 'assistant'}]