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: ENT
[{'content': 'Regarding stapedial reflex, which of the following is true: \nSelect and explain. \nA. It helps to enhance the sound conduction in middle ear, B. It is a protective reflex against loud sound, C. It helps in masking the sound waves, D. It is unilateral reflex', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is b i.e. It is a protective reflex against loud sounds Stapedius muscle helps to dampen very loud sound and thus prevents noise trauma to the inner ear. It is supplied by VII nerve (facial nerve). Lesions of facial nerve lead to loss of stapedial reflex and hyperacusis or phonophobia i.e. intolerance to loud sounds. For more details see chapter - physiology of hearing and assessment of hearing loss of the guide Stapedial reflex = Acoustic reflex', 'role': 'assistant'}]