This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Anatomy
A 60 years old chronic smoker presents with complaints of haemoptysis.her chest X,-ray appears to be normal. What is the next best investigation 
Select and explain. 
A. Bronchoscopy, B. High resolution CT, C. Sputum cytology, D. Pulmonary function test
A: Bronchoscopy
Answer: A: Bronchoscopy 
Explanation: CT scan is unrevealing airway inspection with bronchoscopy should be performed. CT allows better delineation of bronchiectasis, alveolar filling,cavitary infiltration and masses . Ref Harrison 19th edition pg 246,247,512