Question: What is the date of death of Wu Qing (Politician)'s mother?
Sentence (from "Bing Xin"): Xie Wanying (October 5, 1900 – February 28, 1999), better known by her pen name Bing Xin  or Xie Bingxin, was one of the most prolific Chinese writers of the 20th Century.
Relevant evidence: Yes