Which of the following is an example of an acid?

Lemon juice is an example of an acid, containing citric acid, which gives it its sour taste. Acids are substances that release hydrogen ions (H+) when dissolved in water, which lowers the pH of the solution. Citric acid is a weak organic acid found in citrus fruits like lemons and oranges. Acids have a wide range of uses, from food flavoring to cleaning and industrial applications. Their ability to donate protons (H+) makes them essential in many chemical reactions, including digestion and energy production in living organisms.