This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable Diseases, Subject name: Social & Preventive Medicine
A 30 yrs old female has Sputum positive TB. Her child is 3 yrs old. What is the recommended chemoprophylaxis: 
Select and explain. 
A. INH 3mg/kg for 3 months ', B. INH 5mg/kg for 3 months, C. INH 3mg/kg for 6 months, D. INH 5 mg/kg for 6 months
D: INH 5 mg/kg for 6 months
Answer: D: INH 5 mg/kg for 6 months 
Explanation: Ans is 'd' i.e. INH 5 mg/kg for 6 months [Ref: http://health.gov.bz/www/attachments/569_TUBERCULOSIS%20GUIDELINE.pdf; WHO guidelines for Treatment of Tuberculosis at website style="font-size: 1.04761904761905em; color: rgba(0, 102, 204, 1); font-family: Times New Roman, Times, serif">1547833_eng.pdfWHO guidelines for treating child contacts to infectious pulmonary tuberculosis is isoniazid at a dose of 5mg/kg bodyweight for a total of 6 months."Among household contacts, people living with HIV (and children, regardless of their HIV status) who do not have active TB are candidates for isoniazid treatment to prevent the development of active TB WHO guidelines for Treatment of Tuberculosis "The currently WHO guidelines for treating child contacts to infectious PTB is isoniazid at a dose of 5mg/kg bodyweight for a total of 6 months " -http://health.gov.bz/www/attachments/569_TUBERCULOSIS%20GUIDELINE.pdf