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: ENT
A girl for chronic ear discharge, pain on ocular movements and veigo underwent mastoidectomy. There was no relief post-operatively and continuous purulent ear discharge was seen. Patient also had sensorineural hearing loss. The most probable diagnosis would he: 
Select and explain. 
A. Suppurative labyrinthitis, B. Apical petrositis, C. Serous labyrinthitis, D. Lateral sinus thrombophlebitis
B: Apical petrositis
Answer: B: Apical petrositis 
Explanation: Ans. b. Apical petrositis