You just posted it, though you'll need to put quotes around the yes and no values and your field references will need to specify a table occurrence as well as the field names:
YourTableHere::Field_b = "yes" and YourTableHere::field_c = "no"
Note: there are many ways that the design of your layout or your data model might keep this from working as expected.
Thank you for the reminder. And yes, I have experienced some issues with this. Therefore, I re-designed a couple of fields and it is working good.