This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
Bandle ring on uterus suggests 
Select and explain. 
A. Cervical dystocia, B. Cochleate uterus, C. Hypeonic uterus, D. Obstructed labour
D: Obstructed labour
Answer: D: Obstructed labour 
Explanation: In Tonic Uterine Contraction and Retraction, a circular groove encircling the uterus is formed between the active upper segment and the distended lower segment, called pathological retraction ring (Bandl's ring). Reference: D C Dutta Textbook of Obstetrics 7th edition page 362