This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax And Mediastinum, Subject name: Surgery
A patient presents with a cavitatory lesion in right upper lobe of lung. The best investigation is: 
Select and explain. 
A. Bronchoscopy, lavage and brushing, B. CT scan, C. X-ray, D. FNAC
A: Bronchoscopy, lavage and brushing
Answer: A: Bronchoscopy, lavage and brushing 
Explanation: Uses of bronchoscopy Diagnostic Confirmation of disease Carcinoma of the bronchus Inflammatory and infective process Investigative Tissue biopsy Preoperative assessment Before lung resection Before esophageal resection Persistent hemoptysis Therapeutic Removal of secretions Removal of foreign bodies Stent placement, endobronchial resection