Among the following toxic gases in the environment, which one lowers the resistance to pneumonia in human beings?

Options :
  1. Sulphur dioxide
  2. Nitrogen dioxide
  3. Carbon dioxide
  4. Hydrogen chloride

Answer and Explanation :-

Answer: Option 2


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If the single man plants himself indomitably on his instincts, and there abides, this huge world will come around to him.
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