Table: race_results_38
Columns: rnd
circuit
sports_2_0_winning_team
sports_2_0_winning_team_2
gt_2_0_winning_team
gt_2_0_winning_team_2
results

Question: What is the minimum rnd at Laguna Seca?
SQL: SELECT MIN("rnd") FROM race_results_38 WHERE "circuit" = 'Laguna Seca'