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
Why a TB patient is recommend a regimen of 4 drugs on 1st visit - 
Select and explain. 
A. To avoid emergence of persistors, B. To avoid side effects, C. To cure early, D. None
A: To avoid emergence of persistors
Answer: A: To avoid emergence of persistors 
Explanation: Ans. is *a' i.e., To avoid emergence of persistors 6. Two phase chemotheraphyo There are two phase of treatment of tuberculosisIntensive phaseThis is short phase in the early course of treatment and lasts for 1-3 months.Three or more drugs are given to kill as many bacilli as possible, w hich prevents emergence of persisters.The risk of re lapse is also lessened.Continuation phaseIt is aimed at sterilizing the smaller number of dormant or persisting bacilli,o Multidrug treatment in TB is given to -Prevent emergence of persistersPrevent relapsePrevent emergence of resistanceShorten the duration of treatment