Use reasoning to lead to the answer of the following question:
Horses are big animals that get a lot of exercise. Because he this, they need to do what?\nOptions:\n- run quickly\n- pull wagon\n- go away\n- drink water\n- eat carrots
 Reasoning process:
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Horses needs lot of water to drink. Horses are big animals and get lot of exercise. Therefore, the final answer is drink water.
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