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
[{'content': 'Symphysiotomy is indicated in: \nSelect and explain. \nA. Contraction of brim, B. Contraction of cavity, C. Contraction of outlet, D. All of these', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Symphysiotomy is indicated ideallywhen outlet contraction of pelvis is present. It is the operation designed to enlarge pelvic capacity by dividing symphysis pubis', 'role': 'assistant'}]