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
[{'content': 'M/c cause of B/L cornual block seen on HSG: \nSelect and explain. \nA. TB, B. Endometriosis, C. Physiological spasm, D. PID', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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.', 'role': 'assistant'}]