A small piece of chalk made of calcium carbonate can be useful for alleviating acid indigestion because calcium carbonate is
A. able to turn the acid into a gas which can relieve the buildup of excess acid.
B. able to add an extra lining to the stomach to protect it from the excess acid.
C. able to absorb excess acid and carry it out of the system.
D. a base that reacts to neutralize any excess acids.
Answer: D
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