This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fungal infections, Scabies, Pediculosis, Subject name: Dental
[{'content': '"Annular herald patch" is found in \nSelect and explain. \nA. Pityriasis alba, B. Pityriasis rosea, C. Tinea capitis, D. Psoriasis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pityriasis roses is characterised by herald patch/ mother patch it is the first manifestation of disease in 50% of patients it is a well defined erythematous oval or round lesion 2-10 cm diameter with typical colarette of scale at the margin Most common sites - chest back,abdomen extremities. widespread rash appear after herald patch in a span of 5-15 days.', 'role': 'assistant'}]