Question:
Who was the head of Liège in Jun, 1999?

Context:
 Edouard Close is the head of the government of Liège from Jan, 1976 to Jan, 1990. 
 Henri Schlitz is the head of the government of Liège from Jan, 1991 to Jan, 1995. 
 Willy Demeyer is the head of the government of Liège from Sep, 1999 to Sep, 1999. 
 Jean-Maurice Dehousse is the head of the government of Liège from Feb, 1995 to Sep, 1999.

Answer:
Jean-Maurice Dehousse