Correct option is D
Methanoic acid (also known as formic acid) is present in the sting of nettles. This acid contributes to the burning and irritating sensation when stung by nettles.
Oxalic acid: Found in nettles but not the primary component of the sting.
Acetic acid: Found in vinegar, not in nettles.
Citric acid: Found in citrus fruits, not in nettles.
Therefore, the correct answer is (d) Methanoic acid.
