This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cells of epidermis, Subject name: Dental
All the following statements regarding skin are true except 
Select and explain. 
A. Skin is stratified squamous epithelium, B. Melanocytes are immigrant cells, C. Keratin filaments are hallmark of epidermal cells, D. Keratinization causes hydration of cells
D: Keratinization causes hydration of cells
Answer: D: Keratinization causes hydration of cells 
Explanation: Keratinization provides protection, has no role in hydration of cells. The skin has three layers-- the epidermis, dermis and subcutaneous layer (fat layer). Keratinization is a process of cytodifferentiation in which the keratinocytes are differentiated, hardened cell filled with keratin which serves as a scaffold for the cytoskeleton and play a major functional role in the integrity and mechanical stability of cells. Filaggrin helps in keratin assembly and then degrades to for amino acids and natural moisturizing factors which help in skin hydration.