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
False positive fistula test is associated with - 
Select and explain. 
A. Perilymph fistula, B. Malignant sclerosis, C. Congenital syphilis, D. Cholesteatoma
C: Congenital syphilis
Answer: C: Congenital syphilis 
Explanation: False Positive Fistula Test–Hennebert Sign

Fistula test is positive without the presence of fistula.
It is seen in case of congenital syphilis and Meniere’s disease
In congenital syphilis, stapes foot plate is hypermobile while in meniere’s disease there is a fibrous band connecting utricular macula to the stapes footplate.
In both these conditions, movements of stapes result in stimulation of utricular macula which will cause nystagmus and vertigo leading to false positive fistula test. This is called as Hennebert sign.

Ref. Dhingra 5/e, p 47