Direct bronchoscopy can visualize all except:
Ans. is 'd' i.e. Subcarinal lymph nodes Subcarinal lymph nodes are not visualized by bronchoscopy (quite obviously). However transbronchial needle aspiration of subcarinal lymph node can be done, even without its direct visualization. It can be visualized using endoscopic ultrasound.
Trachea
Vocal cords
First segmental subdivision of branch
Subcarinal lymph nodes
Anatomy of Larynx