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
A patient with h/o right ear discharge undergoes mastoidectomy but now he presents with vertigo and deafness. Diagnosis is: 
Select and explain. 
A. Labyrinthitis, B. Thrombophlebitis, C. Temporal lobe abscess, D. Mastoiditis
A: Labyrinthitis
Answer: A: Labyrinthitis 
Explanation: (a) Labyrinthitis(Ref. Cummings, 6th ed., 2169)Following mastoidectomy deafness along with vertigo is suggestive of labyrinthitis.