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': 'Traction force required for forceps delivery In primigravida is: \nSelect and explain. \nA. 15 kg, B. 18 to 20 kg, C. 13 kg, D. 25 kg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Functions of forceps Traction force:in primigravidae the traction force required is about 20kg and that in multipara about 13 kg rotation of head:can be acheived by Kielland&;s forceps act as a protective cage for head from the pressure of bih canal as in a premature baby, controlled delivery of the after coming head in breech D.C.DUTTA&;S TEXTBOOK OF OBSTETRICS,pg no:574,7th edition', 'role': 'assistant'}]