In which of the following options is the substance INCORRECTLY paired with the acid present in that substance?

Lemon - Lactic Acid

The correct answer is option 4. Lemon - Lactic Acid.

The incorrect pairing in the given options is Lemon - Lactic Acid.

Lemons contain citric acid, not lactic acid. Lactic acid is more commonly found in dairy products like yogurt or sour milk. Lemon juice primarily contains citric acid, which gives it its sour taste.