This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: ENT
Lyre sign in seen in 
Select and explain. 
A. Grave's disease, B. Meniere's disease, C. Lateral sinus thrombosis, D. Carotid body tumour
D: Carotid body tumour
Answer: D: Carotid body tumour 
Explanation: Lyre sign is an angiographic finding seen in carotid body tumour of the neck. There is splaying apa of internal and external carotid aeries on angiogram. Ref: Diseases of Ear, Nose and Throat by P.L. Dhingra, 9th edition, p460.