This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiration, Subject name: Pathology
Worst prognosis of associated with which of the following lung cancer? 
Select and explain. 
A. Small cell carcinoma, B. Adenocarcinoma, C. Squamous cell carcinoma, D. Oat cell carcinoma
A: Small cell carcinoma
Answer: A: Small cell carcinoma 
Explanation: Ans. is 'a' i.e. Small cell carcinoma * Small cell carcinomas are the most aggressive of lung tumors, metastasize widely and are virtually incurable by surgical means.