The following are multiple choice questions (with answers) about medical knowledge.   **Question:** 45-year-old presents with persistent productive cough and clubbing. On auscultation, wheeze and crackles are present. Which is the most specific investigation to confirm the diagnosis?   (A) HRCT   (B) Bronchoscopy with bronchoalveolar lavage   (C) Chest X-ray   (D) MRI
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