This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Physiology & Histology, Subject name: Gynaecology & Obstetrics
[{'content': 'Implantation normally occurs in - \nSelect and explain. \nA. Ampulla, B. Bodyof uterus, C. Cervix, D. Ovaries', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e.. Body of uterus "Implantation occurs in the endometrium of anterior or posterior wall of body of uterus near the fundus on the 6th day which corresponds to the 20th day of a regular menstrual cycle."', 'role': 'assistant'}]