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: Unknown
[{'content': 'A 27 years pregnant female with flamingo pink color tympanic membrane comes with history of traumatic ossicular discontinuity. Type of curve expected on tympanometry: \nSelect and explain. \nA. As, B. Ad, C. B, D. C', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Refer: PL Dhingra, Textbook of Ear, Nose, Throat, 6th edition, pg no: 24)\nOtosclerosis (Otospongiosis)\n\nDisease of bony labyrinth where the normal dense enchondral bone is replaced by foci of irregularly laid spongy bone.\n50% patients have positive family history, inherited as autosomal dominant\nWhite races are affected more than negroes\nFemales are more common than males\nPregnancy aggravates otosclerosis\nAge of onset is around puberty\nTypes of otosclerosis', 'role': 'assistant'}]