Which of the following is true about antacids?

Antacids are substances that neutralize stomach acidity, making option B the correct choice. They are commonly used to treat conditions such as heartburn, indigestion, and gastric discomfort by increasing the pH level in the stomach. By counteracting the excess acid, antacids provide relief from symptoms associated with hyperacidity, allowing patients to feel more comfortable.

The other options do not accurately represent the purpose or function of antacids. Inducing vomiting is not a primary use of antacids; rather, they are meant to alleviate discomfort due to excess acid. Antacids also do not treat infections, as their mechanism does not involve combating pathogens. Additionally, the administration of antacids does not require intravenous routes; they are typically available in oral forms, such as tablets or liquid suspensions, making them easily accessible for self-administration.