Task: Question Answering
Input (English): Context: DD 's birthday on Saturday which was her actual day . I did n't do much for her this year because she was against me spending too much money . But I did manage to buy her a brownie cake which turned out to be delicious . We did a pre - celebration on Thursday as both of us had a day off for different reasons and she thought she had to work on her birthday . 
Question: Why might DD be ?
Output (English): The narrator 's girlfriend.