Question:
Who was the chair of Belgian Senate in Dec, 2018?

Context:
 Stephanie D'Hose is the chair of Belgian Senate from Oct, 2020 to Dec, 2022. 
 Jean-Paul Wahl is the chair of Belgian Senate from Jul, 2019 to Jul, 2019. 
 Jacques Brotchi is the chair of Belgian Senate from Dec, 2018 to Jul, 2019. 
 Sabine Laruelle is the chair of Belgian Senate from Jul, 2019 to Oct, 2020.

Answer:
Jacques Brotchi