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
Cut-off value of cervical length at 24 weeks of gestation for prediction of preterm delivery is : 
Select and explain. 
A. 0.5 cm, B. 1.5 cm, C. 2.5 cm, D. 3.5 cm
C: 2.5 cm
Answer: C: 2.5 cm 
Explanation: Ans. is c i.e. 2.5 cm