This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
Erythematous lesions with Collarets of scales on trunk 
Select and explain. 
A. Pityriasis rubra, B. Pityriasis rosea, C. Pityriasis versicolor, D. Pityriasis alba
B: Pityriasis rosea
Answer: B: Pityriasis rosea 
Explanation: .