Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Plant | Part used for food |
| --- | --- |
| potato | root |
| onion | root |
| carrot | root |
| pumpkin | fruit |
| celery | stem |
Question:
Which part of celery is used for food? Select the correct choice to answer the question or fill in the blank.
Choices:
(A) root
(B) fruit
(C) seed
(D) stem
Answer:
(D) stem