Riddle: You use a knife to slice my head and weep beside me when I am dead. What am I?
When we cut the onion, we cut the onion cells. Therefore, the enzymes normally contained in the onion cells are released. The resulting gas reacts with water to form sulfuric acid. When this happens in the eyes, the eyes produce a large amount of water, making the acid neutral and causing tears in the eyes.
Because this sulfuric acid irritates our eyes and our eyes begin to secrete tears to clear foreign substances. Now you know the answer to the riddle and the scientific explanation for the tears of our eyes when we chop onions. The answer of this riddle is an onion.
The correct answer is: An onion.