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A supplement of Vitamin $A$ and Zinc may boost children's resistance to Malaria (observation from one experiment conducted last year in a village $’X’$). Which of the following, if true, would weaken the statement?

  1. No adult in village $’X’$ has fallen sick because of Malaria.
  2. Last three years there is hardly any case of child affected by Malaria from village $'X'$.
  3. The experiment with Vitamin $A$ and Zinc is being duplicated in other nearby cities adjacent to village $’X’$.
  4. Vitamin $A$ and Zinc are readily available in village $'X'$.
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Answer. D

because there is already availability of vitamin A and zinc so the people from village X don't need the supplement.
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Ans is B as it is mentioned since last 3 years there is no case of malaria so we cannot say for sure whether this is due to the resistance developed due to supplement or there is no outbreak of malaria in the village
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