Pneumonia is an infection of-------

Options :
  1. trachea
  2. liver
  3. vocal cord
  4. lungs
Answer and Explanation :-

Answer: Option 4

Explanation:

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Fourscore and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal.
-Abraham Lincoln The Gettysburg Address