This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Contacts of Sputum positive tuberculosis patient who should be given preventive chemotherapy 
Select and explain. 
A. Children below 6 years, B. Old people, C. Children above 6 years, D. Pregnant women
A: Children below 6 years
Answer: A: Children below 6 years 
Explanation: None