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
In lung X-ray, heterogenous shadow is due to: 
Select and explain. 
A. Haemangiorma, B. Pulmonary infarction, C. Metastatic lesion, D. TB
C: Metastatic lesion
Answer: C: Metastatic lesion 
Explanation: C i.e. Metastasis Pulmonary metastasis is radiologically hetrogenousQ due to occurance of cavitation (more common in squamous cell carcinoma) & calcification (most often in osteogenic SAQ & rarely in chondrosarcoma.