The exhausted football player was having trouble breathing fresh air, on the sideline he put on a mask to increase his what?\nOptions:\n- breathing\n- energy\n- think more clearly\n- oxygen intake\n- feeling refreshed
Let's think carefully first. Step-by-step reasoning process:
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A mask helps in oxygen intake. Oxygen intake is important for the survival of any human being. Football player is a human being. So the final answer is oxygen intake.
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