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
Which of the following is/are 1st line antitubercular drugs children- 
Select and explain. 
A. Isoniazid, B. Rifampicin, C. Pyrazinamide, D. Ethambutol
A: Isoniazid
Answer: A: Isoniazid 
Explanation: Park&;s Textbook of Preventive and Social Medicine 23rd edition Page no:195 Tb preventive therapy: the dose of a INH chemoprophylaxis is 10 mg/kg administered daily for 6 months