This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumours of skin, Subject name: Dental
Pityriasis rotunda is: 
Select and explain. 
A. Fungal infection, B. Bacterial infection, C. Pityriasis affecting nail, D. Variant of Ichthyosis
D: Variant of Ichthyosis
Answer: D: Variant of Ichthyosis 
Explanation: Pityriasis rotunda - Pityriasis rotunda is described as a persistent, large, sharply defined circular patch of dry ichthyosiform scaling with no inflammatory changes. Variant of Ichthyosis Fixed, annular, scaling, dry-skin change More often seen in the African and Asian races Associated with neoplasia, paicularly Hepatocellular carcinoma.