Yes, you can file as Single. If you answered Yes to the question 'do you pay more than half the costs of maintainting a household?' and you have a dependent, then TurboTax assigns you the filing status of Head of Househole, which has a higher standard deduction than Single.
Here's more info to help you:
https://turbotax.intuit.com/tax-tips/family/guide-to-filing-taxes-as-head-of-household/L4Nx6DYu9