Rampal, 45 yr old man presents with history of recurrent hemoptysis and purulent sputum. His chest X-Ray is normal, which of the following will be the next best investigation for him?

Medicine

Rampal, 45 yr old man presents with history of recurrent hemoptysis and purulent sputum. His chest X-Ray is normal, which of the following will be the next best investigation for him?

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