It’s pretty simple, really. None of them.
If you’re looking for health guidance, talk to a doctor or have a look at your public health website (the CDC has all sorts of info on theirs). If there really is a health emergency — like when the ebola crisis hit — you’ll hear all about it from this kind of trusted source.
If it’s a story in a newspaper, chances are it’s not as terrifying as you think. Some papers are better than others (The Guardian is usually reasonably on point, and the Daily Mail tends to be, well, wrong), but honestly they are made to sell you stories, not facts. If you’re in doubt, see a doctor!