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
[{'content': 'Earliest ocular finding in acoustic neuroma: \nSelect and explain. \nA. Diplopia, B. Ptosis, C. Loss of corneal sensation, D. Papilloedema', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Earliest nerve involved by acoustic neuroma - Vth nerve / trigeminal nerve. Earliest manifestation of Vth nerve involvement is decreased corneal sensitivity leading to loss of corneal reflex.', 'role': 'assistant'}]