your gcse choices won't necessarily affect your chances of getting into medicine, what's the most important is you're securing as many top grades, i.e ideally 9s but some unis will view 8s as the same as 9s, as possible
triple science will probably be the best in terms of helping the transition to a-level but doing combined won't necessarily disadvantage you.
out of the ones you've listed, for the other subjects that aren't maths/english/science, i personally, going back to when i made my gcse choices, would've just chosen the easiest subjects to get a 9 in as for many medical schools, their selection process includes a points system in which you get points depending on your top 8 or so GCSE grades, and so choosing GCSE's that you know you can get high marks in will generally help you the most
but again, i didn't get all 9s for my GCSEs and i got 4/4 medicine interviews, as all unis pretty much use their own selection process.
basically those are good options imo if you're confident you can do very well in them and also that you enjoy them. i did history and geography at gcse and enjoyed them a lot, and got 9s in both of them so if you need any help in the future you're welcome to ask me ^^