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': "Pink reflex through intact tympanic membrane in active otosclerosis is known as \nSelect and explain. \nA. Schwabach's sign, B. Schwartz sign, C. Lyre's sign, D. Chvostek's sign", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Schwartz sign * Schwartz sign is a pink reflex, seen through intact tympanic membrane, in the area of oval window. It indicates active otosclerosis usually during pregnancy.* Lyre's sign is splaying apart of internal and external carotid arteries on angiogram in cases of carotid body tumour of the neck.* Chvostek's sign seen in hypocalcaemia as after total thyroidectomy where parathyroids have also been removed. Tapping over the distribution of facial nerve produces a twitch.", 'role': 'assistant'}]