This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Imaging of Alveolar Lung Disease, Subject name: Radiology
Flexible Bronchoscope contains holes for all of these functions EXCEPT? 
Select and explain. 
A. Ventilation, B. Drainage of secretion, C. For biopsy, D. To remove foreign body
D: To remove foreign body
Answer: D: To remove foreign body 
Explanation: Ans. (d) To remove foreign bodyRef.: Harrison 19th ed. /1667Foreign body is removed by rigid bronchoscopy.Indications for Rigid Bronchoscopy* Bleeding or hemorrhage* Foreign body extraction* Deeper biopsy specimen when Fiber-optic specimen is inadequate* Dilation of tracheal or bronchial strictures, relief of airway obstruction, insertion of stents, and pediatric bronchoscopy.* It is also used for tracheobronchial laser therapy or other mechanical tumor ablation.