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: Medicine
Most common bronchogenic carcinoma is 
Select and explain. 
A. Small cell carcinoma, B. Squamous cell carcinoma, C. Mixed cell carcinoma, D. Adenocarcinoma
D: Adenocarcinoma
Answer: D: Adenocarcinoma 
Explanation: None