This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anaesthesia
Placement of a double lumen tube (DLT) is best confirmed by: 
Select and explain. 
A. Clinically by Auscultation, B. Fibreoptic bronchoscopy, C. Capnography, D. Chest radiography
B: Fibreoptic bronchoscopy
Answer: B: Fibreoptic bronchoscopy 
Explanation: B. i.e. Fiber optic bronchoscopy