Milk of magnesia, which is magnesium hydroxide, is used to cure stomach acidity. What is the mode of action of this drug?

A) Milk of magnesia is an acid that replaces the hydrochloric acid present in the stomach, thus relieving acidity.
B) Milk of magnesia is a base that neutralizes the excess acid present in the stomach, thus relieving acidity.
C) Milk of magnesia is a salt that neutralizes the excess acid present in the stomach, thus relieving acidity.