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
Bandle's ring on the uterus in labour suggests: 
Select and explain. 
A. Cervical dystocia, B. Colicky uterus, C. Hypeonic lower uterine segment, D. Obstructed labour
D: Obstructed labour
Answer: D: Obstructed labour 
Explanation: Obstructed labour