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
Pulsatile otorrhoea is seen in: 
Select and explain. 
A. Glomus tumour, B. CSF otorrhea, C. ASOM, D. Fistula
C: ASOM
Answer: C: ASOM 
Explanation: 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