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': "Tobey Ayer's Test- \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 Signs of lateral sinus thrombosis (sigmoid sinus thrombosis) o Griesinger's sign:- edema over the posterior part of mastoid due to thrombosis of mastoid emissary veins o Papilloedema o Tobe-Ayer test-:- Compression of vein on the thrombosed side produces no effect while compression of vein on healthy side produces rapid rise in CSF pressure which will be equal to bilateral compression of jugular veins. o Crowe-Beck testPressure on jugular vein of healthy side produces engorgement of retinal veins. Pressure on affected side does not produce such change o Tenderness along jugular vein", 'role': 'assistant'}]