This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Papulosquamous disorders, Subject name: Dental
[{'content': 'Hanging cuain sign is seen in - \nSelect and explain. \nA. PItyriasis alba, B. Pityriasis versicolor, C. Pityriasis miliaris, D. Pityriasis rosea', 'role': 'user'}, {'content': 'Answer: D \nExplanation: pityriasis rosea common self-limiting papulosquamous eruption typically lasting 5-8 weeks. caused due to viral exanthem-HHV6/HHV7 Classical lesions: HERALD patch- 3-5 cm initial oval plaque with colerette of fine scale just inside periphery secondary eruption: long axis of lesions along the lines of cleavage- christmas tree appearence. hanging cuain sign: when the individual lesions stretched across the long axis the scales tend to fold across the lines of stretch. rx- reassurance , self limiting in 5-8 weeks, acyclovir or erythromycin useful in early stages. fitzpatrick textbook of dermatology, page 519', 'role': 'assistant'}]