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
Most common type of carcinoma lung is? 
Select and explain. 
A. Small cell carcinoma, B. Adenocarcinoma, C. Squamous cell carcinoma, D. Large cell carcinoma
B: Adenocarcinoma
Answer: B: Adenocarcinoma 
Explanation: Ans. is 'b' i.e., Adenocarcinoma