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
Rupture of membrane is said to be premature when it occurs at: 
Select and explain. 
A. 38 weeks of pregnancy, B. 32 weeks of pregnancy, C. Prior to 1st stage of labour, D. II stage of labour
C: Prior to 1st stage of labour
Answer: C: Prior to 1st stage of labour 
Explanation: Premature rupture of membranes (PROM) is defined as spontaneous rupture of membranes before the onset of labour. Preterm premature rupture of membranes (PPROM) is defined as premature rupture of membranes before 37 completed weeks.