Here is link that HPA offices across UGs are compiling together for P/F treatment by medical schools. Remove the '...remove...' before docs for actual linkIt seems like you've already decided, but just to throw this in for discussion/future readers:
Last I checked, not all schools were uniformly accepting P/F grades for pre-requisite classes. Some schools have announced that they are accepting them for Spring/Summer work without prejudice, some have said they are accepting them only if they were institutionally mandated, some have said they strongly encourage students to take pre-requisites graded if they have an option, and some have not stated any changed policies.
I would strongly suggest checking the policies at some of the medical schools you would want to apply to before deciding to make sure this choice isn't going to have unexpected long-term effects.
Both a P and a C+ are going to appear similar, so if there's any possibility that the P grade might cause issues in your application down the road, that's something to think about.