This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Gynae), Subject name: Gynaecology & Obstetrics
[{'content': "Augmented retraction ring in labour is known as \nSelect and explain. \nA. Shroder's ring, B. Bandl's ring, C. Hour glass uterus, D. Normal ring", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. b (Bandl's ring). (Ref. Williams, Obstetris 21st/pg.836, Dutta, Obstetrics 4th/pg.367)BANDL'S (PATHOLOGICAL RETRACTION) RING# A circular groove encircling the uterus, formed between active upper segment and distended lower segment.SCHROEDER'S (CONSTRICTION) RING# Situated at the junction of upper and lower segment.# Usually reversible and complete.# May appear in all stages of labour.# Ring is not felt per abdomen, round ligament also not felt.", 'role': 'assistant'}]