This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Larynx, Subject name: ENT
[{'content': 'Follow ing is/ are the causes of chronic cough with noncontributory chest radiograph- \nSelect and explain. \nA. Asthma, B. Post nasal drip, C. GERD, D. All the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., All the above o 90% of patients who have chronic cough and a normal or noncontributory chest radiograph belong to one of the following causes:Use of an angiotensin-converting enzyme inhibitor;Post-nasal drainage;Gastroesophageal reflux; andAsthma.", 'role': 'assistant'}]