If you had the ability to cure 1 disease in the world, what would it be and why?

cancer because it seems to be killing more people than ever, its a horrible disease and I saw my dad suffer and die from it

If you look at the history of medical advances, you'll see that we have indeed conquered many major killers, like polio, smallpox, cholera, etc. And we actually have made great strides against both cancer and AIDS in just the past few decades. 20 years ago AIDS was a death sentence, now it is _almost_ manageable, and people are living almost normal lives. Similarly, many cancers that were terminal 20 or 30 years ago can now be treated quite effectively, and there are even more promising drugs & techniques being tested. Ditto for diabetes and a lot of genetic diseases, which were once major killers but now can be managed to the point where many people with these ailments can lead normal or almost normal lives. With regards to population growth, although we are now living literally decades longer than we were just a century ago, the populations of many of the world's more industrialized countries have leveled off and in some cases (like Japan, Italy and Russia) the population is actually decreasing. This is because once a country reaches a certain level of development, birth rates drop off as society (especially women) becomes more educated and prosperous. And a part of this development process is medical advancements that allow its citizens to lead healthier, more productive lives. So I really don't think we would have anything to fear from a cure for cancer or AIDS.

Cancer. Because of this disease many people have died.

That zombie virus that doesn't exist