Use reasoning to lead to the answer of the following question:
Sam didn't expect to see something like that underground. He used his hand to shade his eyes from what?\nOptions:\n- direct sunlight\n- brightness\n- moon\n- full sunlight\n- bright light
 Reasoning process:
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Hand is used when there is bright light. Bright light is not comfortable for eyes so a person needs to shade his eyes. Therefore, the final answer is bright light.
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