This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
[{'content': 'False positive tuberculin test indicates: \nSelect and explain. \nA. Atypical mycobacteria infection, B. Miliary tuberculosis, C. Immunosuppression, D. Extrapulmonary tuberculosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A false-positive result may be caused by non tuberculous mycobacteria or previous administration of BCG vaccine.', 'role': 'assistant'}]