This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Anatomy
Commonest type of lung carcinoma in non-smokers is 
Select and explain. 
A. Squamous cell carcinoma, B. Small cell carcinoma, C. Adenocarcinoma, D. Alveolar cell carcinoma
C: Adenocarcinoma
Answer: C: Adenocarcinoma 
Explanation: The most common lung carcinoma arising in life time non smokers is adenocarcinoma Commonest lung carcinoma in wolrd Common in females Ref Harrison 19th edition pg 515