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
[{'content': 'Most aggressive lung CA: \nSelect and explain. \nA. Squamous cell CA, B. Adenocarcinoma, C. Small cell lung CA, D. Large cell CA', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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.', 'role': 'assistant'}]