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: Gynaecology & Obstetrics
[{'content': 'Cut-off value of cervical length at 24 weeks of gestation for prediction of preterm delivery is : \nSelect and explain. \nA. 0.5 cm, B. 1.5 cm, C. 2.5 cm, D. 3.5 cm', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is c i.e. 2.5 cm', 'role': 'assistant'}]