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 seen in - \nSelect and explain. \nA. Lateral sinus thrombosis, B. Meningitis, C. Brain abscess, D. Cerebellar abscess", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lateral Sinus Thrombophlepitis\n\nIt is inflammation of the walls of sigmoid sinus (lateral sinus) with the formation of thrombus - Complication of acute coalescent mastoiditis or masked mastoiditis\nAetiology - Chronic SOM with cholesteatoma', 'role': 'assistant'}]