This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CSOM and its Complications, Subject name: ENT
[{'content': "Greisinger's sign is suggestive of- \nSelect and explain. \nA. Acute mastoiditis with lateral sinus thrombosis, B. Maxillary cancer with spread to nasal cavity, C. Rhinosporidiosis, D. Jugular vein thrombosis", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Acute mastoiditis with lateral sinus thrombosis Signs of lateral sinus thrombosis (sigmoid sinus thrombosis)o Griesinger's sign:- odema over the posterior part of mastoid due to thrombosis of mastoid emissary veinso Papilloedemao Tobey-Ayer testo Crowe-Beck test:- Pressure on jugular vein of healthy side produces engorgement of retinal veins. Pressure on affected side does not produce such changeo Tenderness along jugular vein", 'role': 'assistant'}]