Parakeratosis is: (A) Premature and abnormal keratinization, (B) Increased formation of keratin, (C) Nucleated keratinocytes in stratum corneum, (D) Elongated rete ridges
Answer is C. Normally nucleus will be lost in keratinocytes when they reach stratum corneum.
Presence of nucleated keratinocytes in stratum corneum is seen in psoriasis because of decrease in transit time - termed as " parakeratosis"