This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory Radiology, Subject name: Radiology
[{'content': 'Cavitation in pulmonary metastasis is commonly associated with? \nSelect and explain. \nA. Squamous cell carcinoma, B. Adenocarcinoma, C. Chondrosarcoma, D. Osteosarcoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cavitation in pulmonary metastases is a feature of Squamous cell carcinoma. Calcification in pulmonary metastasis is a feature in Osteosarcoma and chondrosarcoma.', 'role': 'assistant'}]