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': 'A positive fistula test during Siegelisation indicates- \nSelect and explain. \nA. Ossicular discontinuity, B. Para-labyrinthitis due to erosion of lateral semicircular canal, C. CSF leak through the ear, D. Fixation of stapes bone', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Fistula test is done to Assess the Vestibular Function\n\nBasis: In case of fistulous communication between middle ear and labyrinth\n\n↓\nAny pressure change in\nExternal auditory canal (produced by pressing tragus or by siegel’s speculum)\n↓\nwill stimulate lateral semicircular canal (Ans 11 – Ref Tuli 1/e p. 939)\n↓\nProduce nystagmus/vertigo', 'role': 'assistant'}]