Question:
Who was the head of Ōsaka Prefecture in May, 2020?

Context:
 Tōru Hashimoto is the head of the government of Ōsaka Prefecture from Feb, 2008 to Oct, 2011. 
 Kazuo Nakagawa is the head of the government of Ōsaka Prefecture from Apr, 1991 to Apr, 1995. 
 Knock Yokoyama is the head of the government of Ōsaka Prefecture from Apr, 1995 to Dec, 1999. 
 Hirofumi Yoshimura is the head of the government of Ōsaka Prefecture from Jan, 2019 to Dec, 2022. 
 Fusae Ōta is the head of the government of Ōsaka Prefecture from Feb, 2000 to Feb, 2008. 
 Ichirō Matsui is the head of the government of Ōsaka Prefecture from Nov, 2011 to Mar, 2019.

Answer:
Hirofumi Yoshimura