Question:
Who was the head of Taitung County in Mar, 2021?

Context:
 Kuang Li-chen is the head of the government of Taitung County from Apr, 2006 to Dec, 2009. 
 Justin Huang is the head of the government of Taitung County from Dec, 2009 to Dec, 2018. 
 Rao Ching-ling is the head of the government of Taitung County from Dec, 2018 to Dec, 2022.

Answer:
Rao Ching-ling