Q. At the apex of cohlea the scala vestivuli and scala tympani communicate with each other through :
A. Fenestra ovalis
B. Fenilestra rotunda
C. Helicotrema
D. Vestibular aqueduct
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C. Helicotrema
Fenestra ovalis and fenestra rotundus are oval and round window respectively. They connect middle ear with inner, so, can't be the answer.
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