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Favorite Answer
Not sure but mostly old questions and all those for which best answer has already been chosen could be the ones having no further option for answering.
mayona
I can tell you that your question was answered 2 months ago and best answer was also awarded but my answer here is a proof that It still could be viewed on yahoo answers and it still has the option of being answered.
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This question still showing up the option to answer even after best answer award and passage of 2 months.