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
Griesinger's sign is observed in which of the following condition? 
Select and explain. 
A. Abducent nerve paralysis, B. Otosclerosis, C. Lateral sinus thrombosis, D. Petrositis
C: Lateral sinus thrombosis
Answer: C: Lateral sinus thrombosis 
Explanation: Griesinger's sign: Erythema and oedema posterior to the mastoid process resulting from septic thrombosis of the mastoid emissary vein. It is seen in lateral sinus thrombosis.