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
Which of the following is not a derivative of the middle ear cleft 
Select and explain. 
A. Semicircular canal, B. Mastoid air cell, C. Tympanic cavity, D. Eustachian tube
A: Semicircular canal
Answer: A: Semicircular canal 
Explanation: Middle ear cleft consists of the eustachian tube, aditus, antrum and mastoid hair cells. Reference: Dhingra 6th edition