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: Pathology
A 65 years old smoker presents with chronic cough, hemoptysis and loss of weight. X ray chest shows cavitatory lesion. The most appropriate diagnosis is 
Select and explain. 
A. Undifferentiated large cell carcinoma, B. Small cell carcinoma, C. Adeno carcinoma, D. Squamous cell carcinoma
D: Squamous cell carcinoma
Answer: D: Squamous cell carcinoma 
Explanation: . Squamous cell carcinoma