[单选题]阿拉伯国家有“医中之王”美誉的人是（ ）。
A.托勒密
B.拉奇斯
C.伊本·西那
D.麦斯欧第

{{B}}How to Retire Earlier{{/B}}
It’s every working staff’s dream: saying goodbye to the daily grind while you still have your own teeth. In our early retirement fantasies, we’re traveling the world, healthy and in the prime of our lives, visiting those hard-to-pronounce countries we’ve always talked about and sampling the finest local fare.
{{B}}Retirement-related Problems{{/B}}
Surveys show that more than half of workers between the ages of 30 and 50 plan to retire before they’re 60. But there’s only one problem with this wishful thinking: Retiring early is easy, but making your money last is hard.
One problem with saving up for early retirement is that we tend not to think beyond those first few glorious years of good health and full checking accounts—we don’t do the long-term math. If the average male life expectancy is 75.2 and we retire at 55, then our savings,