This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'Which of the following is the least vascular pa of uterus : \nSelect and explain. \nA. Lateral, B. Middle, C. Upper, D. Lower', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Middle', 'role': 'assistant'}]