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': "A 70 year old male presents with loss of sensation in external auditory meatus (Hitzelberg's sign positive).The likely diagnosis is - \nSelect and explain. \nA. Vestibular schwannoma, B. Mastoiditis, C. Bells palsy, D. Middle ear cholesteatoma", 'role': 'user'}, {'content': 'Answer: A \nExplanation: This is a case of vestibular schwanoma where involvement of sensory fibres of VIIth nerve leads to anesthesia over the postero superior part of external meatus and canal. This is known as Hitselberger sign.', 'role': 'assistant'}]