This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sexually Transmitted Disease in the Female, Subject name: Gynaecology & Obstetrics
M/c cause of B/L cornual block seen on HSG: 
Select and explain. 
A. TB, B. Endometriosis, C. Physiological spasm, D. PID
C: Physiological spasm
Answer: C: Physiological spasm 
Explanation: Ans. is c, i.e. Physiological spasmOn HSG in TB: B/L cornual blockage can be seen but M/c cause of bilateral cornual block on HSG is not genital TB. It is physiological block due to spasm of the cornual end of the tube while doing HSG.