Name the kings of Belgium from 1831 until the present day
From 1944 to 1950 Leopold III was in exile and replaced by his brother, the prince-regent Charles. However, as he did not bear the title of "King", I have excluded him from this list.
Evil aliens have decided to kill everyone in Europe! Fortunately, they've given you 45 seconds to save as many as you can. All you have to do is name a country to save everyone in it.