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
[{'content': '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 \nSelect and explain. \nA. Bronchoscopy, B. High resolution CT, C. Sputum cytology, D. Pulmonary function test', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]