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: Microbiology
[{'content': 'True about mantoux is - \nSelect and explain. \nA. False negative in fulminant diseases, B. If once done, next time it is always positive, C. Results are given in terms of positive & negative, D. Indurations given in terms of length & breadth', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]