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': "Griesinger's sign is observed in which of the following condition? \nSelect and explain. \nA. Abducent nerve paralysis, B. Otosclerosis, C. Lateral sinus thrombosis, D. Petrositis", 'role': 'user'}, {'content': "Answer: C \nExplanation: 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.", 'role': 'assistant'}]