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': 'Not true about lepromin test is \nSelect and explain. \nA. It is diagnostic, B. Negative in infants < 6 months, C. Used to classify, D. BCG vaccination may conve negative to positive', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. It is diagnostic', 'role': 'assistant'}]