Stinging hair of nettle leaves inject fluid in the human body causing burning pain. The fluid is

  1. A. Methanoic acid
  2. B. Tartaric acid
  3. C. Hydrochloric acid
  4. D. Sulphuric acid

Correct Answer: A. Methanoic acid

Explanation

Nettle leaf stings contain methanoic acid (also known as formic acid), which causes a burning sensation and pain upon entering the skin.

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