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
False positive tuberculin test indicates: 
Select and explain. 
A. Atypical mycobacteria infection, B. Miliary tuberculosis, C. Immunosuppression, D. Extrapulmonary tuberculosis
A: Atypical mycobacteria infection
Answer: A: Atypical mycobacteria infection 
Explanation: A false-positive result may be caused by non tuberculous mycobacteria or previous administration of BCG vaccine.