This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'Queckenstedt test is done for \nSelect and explain. \nA. Glomus tumor, B. CSF rhinorrhea, C. Otosclerosis, D. Acoustic neuroma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Drainage of CSF in some cases may often be elicited on endoscopy by having the patient perform a Valsalva maneuver or by compressing both jugular veins (Queckenstedt-Stookeytest) Ref : internet sources', 'role': 'assistant'}]