This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
Lighthouse sign is seen in ASOM in which stage 
Select and explain. 
A. Stage of suppuration, B. Stage of hyperemia, C. Stage of resolution, D. Stage of presuppuration
C: Stage of resolution
Answer: C: Stage of resolution 
Explanation: Lighthouse sign: It means flowing out of discharge from the perforation in the tympanic membrane. The external auditory canal may obtain blood tinged discharge which later becomes mucopurulent. Usually, a small perforation is seen in anteroinferior quadrant of pars tensa. Hyperaemia of the tympanic membrane begins to subside with a return to normal colour and landmarks. (Ref: Textbook of diseases of ENT, PL Dhingra 7th edition, pg no. 68)