...what would your speciality be?
I'd be torn between gynaecology to help the maximum number of women that I could (not least because we've been second class in so many areas of healthcare over the years) or endocrinology because it sounds fascinating and based on what little I know of it, it seems to be linked to so many other issues - it feels like we're still scratching the surface of what we know about hormones and their impact on various conditions.
(This is a very random musing - I have no medical connections at all, other than as a patient!)