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
AG2P1  to female has a history of previous preterm birth at 32 weeks. The percentage chances of preterm birth in this pregnancy are: 
Select and explain. 
A. 15%, B. 5%, C. 10%, D. 25%
A: 15%
Answer: A: 15% 
Explanation: Preterm labour is defined as spontaneous expulsion of the products of conception after viability and before 37 completed weeks.
Prior preterm birth is a very good predictor of subsequent preterm labour. There is a three-fold increase in risk for these women