user: Question: How many segment C are there in the episode where segment D is Bicycle Tires?
Columns: ['Series Ep.', 'Episode', 'Segment A', 'Segment B', 'Segment C', 'Segment D']
Types: ['text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['20-01', 248.0, 'Native Healing Drums', 's Raisin', 'Stereoscopic Viewers', 'Ribbon Microphones']
SQL:

assistant: SELECT COUNT("Segment C") FROM "Table" WHERE "Segment D" = 'Bicycle Tires';