Unfortunately the answer is that it depends...
An interviewer may challenge your view just to see how you react, or they may genuinely think you've got something wrong. I think you just need to judge the situation and try to see what they may be getting at - we don't want people to be inflexible in the face of compelling arguments or facts which undermine their position, but equally if you think you have strong grounds for your opinions there is nothing wrong with sticking to them. In that case I think you just need to be able to show that you understand the other person and reason through their perspective to see if you need to adjust your own.
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