This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'Which of the following is consistent with a decision to perform a cerclage? \nSelect and explain. \nA. Uterine contractions, B. Cervix dilated to 3 cm, C. Uterine bleeding, D. Gestation of 26 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The treatment of the apparently incompetent cervix is surgical and consists of reinforcing the weak cervix by some kind of purse-string suture.It is best performed after the first trimester, but before cervical dilatation of 4 cm, if possible.Bleeding, infection and uterine contractions are contraindications to surgery', 'role': 'assistant'}]