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: Unknown
A child is presenting with erythematous follicular papules on the trunk. There are areas of normal skin within the lesions. There is thickening of Palms & soles. This child is suffering from - 
Select and explain. 
A. Pityriasis rosea, B. Pityriasis rubra pilaris, C. Psoriasis, D. Seborrheic dermatitis
B: Pityriasis rubra pilaris
Answer: B: Pityriasis rubra pilaris 
Explanation: Ans-B