This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abnormal labor, Subject name: Gynaecology & Obstetrics
AG2P1 to female has a history of previous preterm bih at 32 weeks. The percentage chances of preterm bih in this pregnancy are: 
Select and explain. 
A. 5%, B. 10%, C. 15%, D. 25%
C: 15%
Answer: C: 15% 
Explanation: Preterm labour is defined as spontaneous expulsion of the products of conception after bility and before 37 completed weeks.Prior preterm bih is a very good predictor of subsequent preterm labour.There is three fold increase in risk for these women (refer pgno:193 sheila textbook of obstetrics 2 nd edition)