There are a few possible reasons for this. One reason could be that the person is not familiar with the topic and is unsure of what to say. Another reason could be that they are trying to gather their thoughts and formulate a response before answering. Additionally, they may be hesitant to give an answer because they are afraid of being judged or criticized for their opinion. Finally, it's also possible that they simply don't have an answer to the question and are stalling for time.

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