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 the involvement of \nSelect and explain. \nA. Abducent nerve, B. Facial nerve, C. Optic nerve, D. Occulomotor nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Gradenigo syndrome is the classical presentation and consists of a triad of (i) external rectus palsy (VIth nerve palsy),(ii) deep-seated ear or retro-orbital pain (Vth nerve involvement) and (iii) persistent ear dischargeDue to petrositis in CSOM.(Spread of infection from middle ear and mastoid to the petrous pa of the temporal bone is called petrositis.)Dhingra 6e pg: 79', 'role': 'assistant'}]