user: Question: If the distribution mechanism is Windows NT 4.0 Option Pack Microsoft Office 97 and the features is Service release, what is the version?
Columns: ['Version', 'Release date', 'Distribution mechanism', 'Features', 'Security issues']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1.5a', 'September 1997–March 1998', 'Microsoft website', 'Service release', '99-025']
SQL:

assistant: SELECT "Version" FROM "Table" WHERE "Features" = 'Service release' AND "Distribution mechanism" = 'Windows NT 4.0 Option Pack Microsoft Office 97';