In the "add a dependent" prompts, we have to select whether one or both of us are legal parents. Because this a is foster child, we are not her parents. What do we select

The child is still our dependent since she has lived with us in care for over 6 months. Do we just select both my husband and I as "legal parents" as a technicality? Shouldn't there be an option for "Ward of the State" if you can file for a foster child under the "my child" category?