Please answer the following question: Answer the following question given this paragraph: A: The copper has become tarnished. The tarnishalso called patinais a compound called copper carbonate, which is green. Copper carbonate forms when copper undergoes a chemical reaction with carbon dioxide in moist air. The green patina that forms on copper actually preserves the underlying metal. That's why it's not removed from the statue. Some people also think that the patina looks attractive. Q: What compound gives tarnished copper it's green color? Choices: - bronze - zinc - brass - copper carbonate A:
A:
copper carbonate