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:
| Name | Occupation | Gender | Prison connection | Played by | Status |
| --- | --- | --- | --- | --- | --- |
| Kazan | Autistic Savant | Male | Kazan Prison (Russia) | Andrew Miller | Alive after exiting the Cube |
| David Worth | Architect | Male | Leavenworth Prison (USA) | David Hewlett | Dead |
| Quentin | Police officer | Male | San Quentin State Prison (USA) | Maurice Dean Wint | Dead |
| Joan Leaven | Mathematics Student | Female | Leavenworth Prison (USA) | Nicole de Boer | Dead |
| Dr. Helen Holloway | Free Clinic Doctor | Female | Holloway Women's Prison (UK) | Nicky Guadagni | Dead |
| Rennes | Prison escapist | Male | Centre pénitentiaire de Rennes (France) | Wayne Robson | Dead |
Question:
What is Joan Leaven's occupation?
Answer:
Mathematics Student