Question:
Which political party did Mumtaz Bhutto belong to in Feb, 1990?

Context:
 Mumtaz Bhutto is a member of the Pakistan Tehreek-e-Insaf from Jan, 2017 to Jan, 2021. 
 Mumtaz Bhutto is a member of the Sindh National Front from Jan, 1989 to Jan, 2017. 
 Mumtaz Bhutto is a member of the Pakistan Peoples Party from Jan, 1967 to Jan, 1989.

Answer:
Sindh National Front