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
The distribution of keratins (K) in the basal layers is: 
Select and explain. 
A. K5/K14, B. K1/K10, C. K2/K11, D. K6/K16
A: K5/K14
Answer: A: K5/K14 
Explanation: Basal layer has keratin types K5/K14 Keratin Heterodimer Sites K 5/14 Stratum basale - If defective- Epidermolysis Bullosa simplex K 1/10 Stratum Spinosum K 2/11 Stratum Granulosum K 3/12 Cornea - If defective - Corneal dystrophy K 4/13 Buccal mucosa K 6/16 Nails K 8/18 Liver - If defective - Liver cirrhosis