I feel like helping but I can't properly!
Whatever is printed on the certificate as the subject is what I have selected/entered as this is what it is officially called. but it sounds more as though you should have health and social care because it describes the course.
If it was me I'd enter health and social care and then list the units underneath BUT check with someone first because I'm totally guessing! If you haven't got anyone to ask at college you could try ringing up the ucas people because they're pretty helpful with stuff like this...