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: Skin
[{'content': 'Treatment of choice in the cutaneous complication of porphyria is : \nSelect and explain. \nA. I. V dextrose, B. I. V Haematin, C. Beta carotene, D. Calamine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C. i.e. B carotene', 'role': 'assistant'}]