Question:
Who was the chair of Belgian Senate in Jul, 2019?

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

Answer:
Jean-Paul Wahl