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: Pathology
Scar carcinoma of lung is seen most commonly following -a)  Tuberculosisb)  Irradiationc)  Infarctd)  Lung abscess 
Select and explain. 
A. abc, B. bc, C. acd, D. bcd
A: abc
Answer: A: abc 
Explanation: Scar Ca seen after → Old infarcts, metallic foreign bodies, wounds, granulomatous infection such as T.B. These carcinomas are usually Adenocarcinomas