This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'Which of the following is not true about Porphyria cutanea tarda (PCT)? \nSelect and explain. \nA. Is the least common type of human porphyria, B. Decreased activity of the enzyme uroporphyrinogen decarboxylase, C. Prior hepatitis C virus infection appears to be an independent risk factor, D. Treatment of PCT consists of repeated phlebotomies', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Porphyria cutanea tarda is the most common type of human porphyria and is associated with decreased activity of the enzyme uroporphyrinogen decarboxylase associated with a number of gene mutations.', 'role': 'assistant'}]