This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory, Subject name: Medicine
65-year-old man presented with hemoptysis and stage 3 clubbing. The probable diagnosis of the patient is? 
Select and explain. 
A. Non- small cell lung Ca, B. Small cell cancer of lung, C. Tuberculosis, D. Sarcoidosis
A: Non- small cell lung Ca
Answer: A: Non- small cell lung Ca 
Explanation: Ans. A. Non- small cell lung Ca* Most common cause of hemoptysis is tuberculosis but at 65 years of age it is more likely a presentation of lung cancer.* Lung cancers can cause hemoptysis but clubbing is seen with non- small cell cancer of the lung only. Remember that clubbing is absent in small cell cancer of the lung.