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: Social & Preventive Medicine
[{'content': 'Which of the following about lepromin test is not true? \nSelect and explain. \nA. It is negative in most children in first six months, B. BCG vaccination may convert lepra reaction from negative to positive, C. It is a diagnostic test, D. It is an important aid to classify type of leprosy disease', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]