This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Impoant Bacterial Diseases in Children, Subject name: Pediatrics
A 3 month old, asymptomatic infant with, H/o TB exposure, has taken 3 months of chemoprophylaxis( isoniazid ), what is to be done next? 
Select and explain. 
A. Test sputum and then decide, B. Continue for 3 more months, C. Tuberculin test then decide, D. Immunise with BCG & stop prophylaxis
B: Continue for 3 more months
Answer: B: Continue for 3 more months 
Explanation: A child born to mother who was diagnosed to have TB in pregnancy should receive prophylaxis for 6 months, provided congenital TB has been ruled out