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
Cavitation in pulmonary metastasis is commonly associated with? 
Select and explain. 
A. Squamous cell carcinoma, B. Adenocarcinoma, C. Chondrosarcoma, D. Osteosarcoma
A: Squamous cell carcinoma
Answer: A: Squamous cell carcinoma 
Explanation: Cavitation in pulmonary metastases is a feature of Squamous cell carcinoma. Calcification in pulmonary metastasis is a feature in Osteosarcoma and chondrosarcoma.