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
Eustachian tube opens in? 
Select and explain. 
A. Inner ear, B. Middle ear, C. Outer ear, D. Larynx
B: Middle ear
Answer: B: Middle ear 
Explanation: Ans. is 'b' i.e., Middle ear * Eustachian tube (pharyngotympanic tube) is a channel connecting the tympanic cavity (middle ear cavity) with nasopharynx. Therefore, ear infection can travel to throat through eustachian tube and vice-versa.* Eustachion tube opens into anterior wall (carotid wall) of medial ear.