user: Question: What is the number of gt1 winning team for rnd 5?
Columns: ['Rnd', 'Circuit', 'CA Winning Team', 'GT1 Winning Team', 'GT2 Winning Team', 'GT3 Winning Team', 'Results']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Daytona', '#30 Doran/ Moretti Racing', '#01 Rohr Motorsport', '#97 Konrad Motorsport', '#10 PTG', 'Results']
SQL:

assistant: SELECT COUNT("GT1 Winning Team") FROM "Table" WHERE "Rnd" = 5.0;