user: Question: Frequency MHz of 93.7 has what class?
Columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'Class', 'FCC info']
Types: ['text', 'real', 'text', 'real', 'text', 'text']
Sample row: ['KNGM', 88.9, 'Guymon, Oklahoma', 25000.0, 'C3', 'FCC']
SQL:

assistant: SELECT "Class" FROM "Table" WHERE "Frequency MHz" = 93.7;