A positive fistula test during Siegelisation indicates-: (A) Ossicular discontinuity, (B) Para-labyrinthitis due to erosion of lateral semicircular canal, (C) CSF leak through the ear, (D) Fixation of stapes bone
Answer is B. Fistula test is done to Assess the Vestibular Function

Basis: In case of fistulous communication between middle ear and labyrinth

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Any pressure change in
External auditory canal (produced by pressing tragus or by siegel’s speculum)
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will stimulate lateral semicircular canal (Ans 11 – Ref Tuli 1/e p. 939)
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Produce nystagmus/vertigo