Use reasoning to lead to the answer of the following question:
What was the hardest thing for her to do while learning to ski?\nOptions:\n- slip on ice\n- fall down\n- fall over\n- sweat\n- maintain balance
 Reasoning process:
User
A person needs to maintain balance while doing ski. While learning to ski, the hardest thing for her is to maintain balance. Therefore, the final answer is maintain balance.
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