This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
[{'content': 'The small intestine is characterized by basal crypts and superficial villi (Figure below). Where does cell division take place?Schematic representation of villi and crypts of Lieberkuhn \nSelect and explain. \nA. Submucosa, B. Crypts, C. Villi, D. Small-bowel lumen', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Small-bowel turnover can be measured in rats by autoradiographic studies in which turnover of cells located in the crypts migrate along the villus toward the tip over a 2- to 3- day period. Intestinal villous mucosa undergoes hypertrophy and hyperplasia whenever an increased food load continuously enters the small intestine.', 'role': 'assistant'}]