user: Question: What is the Home team score for Geelong, whereby the Away team has a score of 18.13 (121)?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Geelong', '14.6 (90)', 'North Melbourne', '18.13 (121)', 'Kardinia Park', 18868.0, '4 June 1973']
SQL:

assistant: SELECT "Home team score" FROM "Table" WHERE "Away team score" = '18.13 (121)';