This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Layers of epidermis, dermis, Subject name: Dental
[{'content': 'Normal turnover rate of epidermis: \nSelect and explain. \nA. 2 weeks, B. 4 weeks, C. 6 weeks, D. 8 weeks', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Epidermal turnover time - skin doubling time -Time taken by keratinocytes to move from Stratum Basale to environment. -Around 14 days are required to move from Stratum Basale to reach lowermost layer of Stratum Corneum & 14 days to cross Stratum Corneum. -Sloughing off requires 28 days So total ETT =56 days (8 weeks) The turnover time in psoriasis = 4 days.', 'role': 'assistant'}]