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
Earliest ocular finding in acoustic neuroma: 
Select and explain. 
A. Diplopia, B. Ptosis, C. Loss of corneal sensation, D. Papilloedema
C: Loss of corneal sensation
Answer: C: Loss of corneal sensation 
Explanation: 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.