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:
What plant's root is used for food? Select the correct choice to answer the question or fill in the blank.
Choices:
(A) pumpkin
(B) apple
(C) onion
(D) celery
Answer:
(C) onion