Task: Question Answering
Input (English): Context: One day my sister came and picked me up , and I was relaxing in her car . I had my arms behind my head , thinking of nothing in particular , when suddenly she mentioned that my armpits stank . She did n't say it in a mean or hurtful way , but I was still embarrassed , because it was my body , and it was yet another thing I had to deal with , had to think about , had to mask , had to play down . 
Question: Why does the author 's sister 's comment most probably give rise to a sense of embarrassment in the author ?
Output (English): the author was most likely caught completely by surprise as they were not previously aware of the issue.