This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Characteristics and Epidemiology of Neoplasia, Subject name: Pathology
Most aggressive lung CA: 
Select and explain. 
A. Squamous cell CA, B. Adenocarcinoma, C. Small cell lung CA, D. Large cell CA
C: Small cell lung CA
Answer: C: Small cell lung CA 
Explanation: Ans. (c) Small cell lung CARef: Robbings 9th ed./ 717* Small cell carcinoma is a highly malignant tumor with a strong relationship to cigarette smoking.* Around 1% occurs in nonsmokers.* They are the most aggressive of lung tumors, metastasizing widely and are always fatal.