Possible Clues:

• 'Actually, I do'
• 'But of course!'
• 'Indubitably!'
• Surprised affirmation
• 'As a matter of fact, that's right'
• 'In fact, I do!'
• "As a matter of fact, I do!"
• "In fact, I do!"
• ''But of course!''
• "But of course!"