user: Question: What is the methyl red reading for the species that tests Positive for indole?
Columns: ['Species', 'Indole', 'Methyl Red', 'Voges-Proskauer', 'Citrate']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Escherichia coli', 'Positive', 'Positive', 'Negative', 'Negative']
SQL:

assistant: SELECT "Methyl Red" FROM "Table" WHERE "Indole" = 'Positive';