Question: Where is the multi-purpose stadium which 2019 World Championships in Athletics is to be held located 
Sentence (from "Khalifa International Stadium"): Khalifa International Stadium (Arabic: ملعب خليفة الدولي‎ ‎ ) also known as National Stadium is a multi-purpose stadium in Doha, Qatar as part of the Doha Sports City complex, which also includes Aspire Academy, Hamad Aquatic Centre, and the Aspire Tower.
Relevant evidence: Yes