I say do not bring it up during the interview unless you are directly asked about that chemistry grade. You can deflect it by saying you improved overall. I was never asked about grades during interviews. Be reactive as opposed to proactive in this subject.
If you get an interview, you probably have passed the requirements for that school, and acceptance will depend upon more on interview at that point, not one undergrad class.
As a side note, in the world of medicine, disability or not, the medical community can be pretty unforgiving. Many old school administrators think that if you have a disability, you better work through it, as your patient's lives will depend on you. Wait until after the first day of med school before you tell them about disabilities, unless of course you need special equipment/access. That's my long winded two cents.
sscooterguy