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': 'PUVA is used for all except \nSelect and explain. \nA. Psoriasis, B. Vitiligo, C. Porphyria, D. Cutaneous T-cell lymphoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: PUVA is a combination treatment which consists of Psoralens (P) and then exposing the skin to UVA (long wave ultraviolet radiation). PUVA may be used to treat various skin disorders, including: Psoriasis Dermatitis Vitiligo Polymorphic light eruption Cutaneous T-cell lymphoma Porphyria has photosensitivity and PUVA aggravates it. Ref: Harrison 19e pg: 348', 'role': 'assistant'}]