This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: The Amnion and Umbilical Cord, Subject name: Gynaecology & Obstetrics
[{'content': 'Length of umbilical cord is? \nSelect and explain. \nA. 40-50 cms, B. 60- 120 cms, C. 30-100 cms, D. 25-40 cms', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ANSWER: (C) 30-100 cmsREF: Dutta 6th ed p. 40The normal length of umblical cord is around 50cms with usual variation between 30-100 cms', 'role': 'assistant'}]