This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S., Subject name: Medicine
[{'content': 'This lesion is seen in which condition: \nSelect and explain. \nA. NF1, B. NF2, C. Tuberous sclerosis, D. VHL', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. NF2a. The image is of acoustic neuroma. This is noncancerous growth which develops on the inferior vestibular nerve. These tumors usually grow slowly over a period of years. These do not invade the brain & usually affects cranial nerves, Vth, VIth, VIIth, VIIIth.b. Earliest nerve to get involve is Vth nerve. Earlies sign is loss of corneal reflex.', 'role': 'assistant'}]