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': 'Pulsatile otorrhoea is seen in: \nSelect and explain. \nA. Glomus tumour, B. CSF otorrhea, C. ASOM, D. Fistula', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C ASOMASOM -In stage of suppuration-pulsatile otorrhea is present .Light house sign: Seen in ASOM when pulsatile otorrhea reflects light intermittently on-otoscopy', 'role': 'assistant'}]