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
Two months after tonsillectomy the patient has referred pain to ear, cause is - 
Select and explain. 
A. Temporomandibular joint dislocation, B. Injury to glossopharyngeal (9th cranial) nerve, C. Injury to vagus nerve, D. Infection of tonsillar bed
B: Injury to glossopharyngeal (9th cranial) nerve
Answer: B: Injury to glossopharyngeal (9th cranial) nerve 
Explanation: None