This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous ENT, Subject name: ENT
[{'content': "Muller's manoeuvre is used to \nSelect and explain. \nA. To find out opening of mouth, B. To remove laryngeal foreign body, C. To find degree of obstruction in sleep disordered breathing, D. To remove foreign body from ear", 'role': 'user'}, {'content': "Answer: C \nExplanation: Muller's manoeuvre is used to find level and degree of obstruction in sleep-disordered breathing with flexible nasopharyngoscope Ref: Textbook of ENT, Dhingra; 6th edition; Pg no: 449 ref img", 'role': 'assistant'}]