Question:
Which position did Tsai Ing-wen hold in Jan, 2006?

Context:
 Tsai Ing-wen holds the position of Member of the Legislative Yuan from Feb, 2005 to Jan, 2006. 
 Tsai Ing-wen holds the position of Chairperson of the Democratic Progressive Party from May, 2020 to Nov, 2022. 
 Tsai Ing-wen holds the position of President of the Republic of China from May, 2016 to Dec, 2022. 
 Tsai Ing-wen holds the position of Vice Premier of the Republic of China from Jan, 2006 to May, 2007.

Answer:
Member of the Legislative Yuan