President-elect Donald Trump on Tuesday tapped Dr. Mehmet Oz, a former television talk show host and heart surgeon, to head the agency that oversees health insurance programs for millions of older, poor and disabled Americans. “Dr. Oz will be a leader in incentivizing Disease Prevention, so we get the best results in the World for every dollar we spend on Healthcare in our Great Country,” Trump said in a statement. “He will also cut waste and fraud within our Country’s most expensive Government Agency, which is a third of our Nation’s Healthcare spend, and a quarter of our entire National...