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
Muller's manoeuvre is used to 
Select and explain. 
A. 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
C: To find degree of obstruction in sleep disordered breathing
Answer: C: To find degree of obstruction in sleep disordered breathing 
Explanation: 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