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: Surgery
Commonest symptom of carcinoma bronchus is - 
Select and explain. 
A. Hemoptysis, B. Dyspnoea, C. Cough, D. Wheezing
C: Cough
Answer: C: Cough 
Explanation: None