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
[{'content': "Gradenigo's triad is caused due to involvement of \nSelect and explain. \nA. Abducens nerve, B. Facial nerve, C. Optic nerve, D. Vestibulocochlear nerve", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Gradenigo Syndrome (GS) is classically described as a clinicaltriad of otitis media, facial pain, and abducens palsy that in the past most commonly developed from infection in the petrous temporal bone (i.e., petrous apicitis). Ref otolaryngology dhingra 3e p278', 'role': 'assistant'}]