This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pathology
Dyskeratosis 
Select and explain. 
A. Leukoplakia, B. Hyperpigmentation, C. Nail dystrophy, D. Premature keratinisation
D: Premature keratinisation
Answer: D: Premature keratinisation 
Explanation: dys*ker*a*to*sis (dis'ker-a-to'sis), 1. Premature keratinization in individual epithelial cells that have not reached the keratinizing surface layer; dyskeratotic cells generally become rounded and they may break away from adjacent cells and fall off. Dyskeratosis terms that abnormal premature keratinisation within cells below the stratum granulosum. Ref: Robbins and cotrans 9e Pg 1143