This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Skin
Peripheral 'Collarette of scales' is a feature of: 
Select and explain. 
A. P. rosea, B. P.veriscolor, C. Lichen planus, D. Pityriasis rubra pilaris
A: P. rosea
Answer: A: P. rosea 
Explanation: Clinical features of Pityriasis rosea is the rash which consists of circular or oval pink macules with a 'collarette of scale' and is more prominent on the trunk than on the limbs. Ref: Kumar and Clark's Clinical Medicine by Parveen June Kumar, Michael L. Clark, Elsevier Saunders, 2005, Page 1335; Thieme Clinical Companions Dermatology By Wolfram Sterry, Walter Burgdorf, Ralf Paus, 2006, Pages 279-280