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: Dental
[{'content': 'Normal transit time of keratinocytes is \nSelect and explain. \nA. 3 weeks, B. 4 weeks, C. 5 weeks, D. 6 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Transit time\xa0is the time required for the basal cells to reach uppermost part of epidermis,which is 4 weeks.It is decreased in psoriasis.', 'role': 'assistant'}]