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': "Picket fence fever is a feature of- \nSelect and explain. \nA. Acute mastoiditis, B. Lateral sinus thrombophlebitis, C. Bell's Palsy, D. Atticoantral CSOM", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Lateral sinus thrombophlebitis Signs of lateral sinus thrombosis (sigmoid sinus thrombosis)o Hectic Picket-Fence type of fever with rigor.o Headache, Progressive anemia and emaciation.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'}]