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:
| Rank | Name | Notability | Birthplace | Advocate |
| --- | --- | --- | --- | --- |
| 10 | Wayne Gretzky | Hockey player, holder of numerous NHL records | Brantford, Ontario | Deborah Grey |
| 9 | Alexander Graham Bell | Scientist, inventor,\nfounder of the Bell Telephone Company | Edinburgh, Scotland | Evan Solomon |
| 8 | Sir John A. Macdonald | First Prime Minister of Canada | Glasgow, Scotland | Charlotte Gray |
| 7 | Don Cherry | Hockey coach and commentator | Kingston, Ontario | Bret Hart |
| 6 | Lester B. Pearson | Fourteenth Prime Minister of Canada,\nUnited Nations General Assembly President,\nNobel Peace Prize Laureate | Toronto, Ontario | Paul Gross |
| 5 | David Suzuki | Environmentalist | Vancouver, British Columbia | Melissa Auf der Maur |
| 4 | Sir Frederick Banting | Medical scientist, co-discoverer of insulin,\nwinner of the Nobel Prize in Physiology or Medicine | Alliston, Ontario | Mary Walsh |
| 3 | Pierre Trudeau | Fifteenth Prime Minister of Canada | Montreal, Quebec | Rex Murphy |
| 2 | Terry Fox | Athlete, activist, humanitarian | Winnipeg, Manitoba | Sook-Yin Lee |
| 1 | Tommy Douglas | Father of Medicare, Premier of Saskatchewan | Falkirk, Scotland | George Stroumboulopoulos |
Question:
which canadian was ranked first and considered the greatest?
Answer:
Tommy Douglas