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: Dental
[{'content': 'Which of the following statements is true regarding Pityriasis rubra pilaris – a) Isolated patches of normal skin are foundb) Cephalocaudal distributionc) I.V. cyclosporine is effectived) More common in femalese) Oral cyclosporine is effective \nSelect and explain. \nA. ab, B. c, C. ac, D. ad', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A characteristic feature of plaques of pityriasis rubra pilaris is the presence of distinct islands of normal skin.\nLesions on the trunk evolve in craniocaudal (cephalo caudal) direction.', 'role': 'assistant'}]