A 30yr old lady was diagnosed with sputum smear positive tuberculosis. She has a 3yr old child who is asymptomatic. Which of the following should be used as prophylaxis for the child?
A. INH 3mg/kg for 3mths
B. INH 3mg/kg for 6mths
C. INH 5mg/kg for 3mths
D. INH 5mg/kg for 6mths
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