Medicine Cough of more than 3 months duration in a non-smoker with normal chest X-ray. All reasons are true EXCEPT: March 2013 (e) A Post nasal drip B Asthma C Gastroesophgeal reflux D Common cold 💡 Explanation Cough of more than 3 months duration in a non-smoker with normal chest X-ray. All reasons are true EXCEPT: March 2013 (e) ✓ Correct Answer: D. Common cold