user: Question:  who is the founder where date is c. 1900
Columns: ['Date', 'Founder', 'Extroversion Scales', 'People-task orientation scale', 'Introverted, Task-Oriented', 'Extroverted, Task-Oriented', 'Extroverted, Relationship-Oriented', 'Introverted, Relationship Oriented', 'Moderate']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['c. 450 BC', 'Classical elements', 'Scales not recognized', 'Areas not recognized', 'earth', 'fire', 'air', 'water', 'ether']
SQL:

assistant: SELECT "Founder" FROM "Table" WHERE "Date" = 'c. 1900';