Question: Who is playing the first day of the world cup?
Disambiguated questions and answers: question: Who is playing the the first match, the first day of the 2014 world cup?
Who is playing the the first match, the first day of the 2010 world cup?
Who is playing the the first match, the first day of the 2006 world cup?
answer: Brazil
Croatia
Brazil and Croatia
South Africa
Mexico
South Africa and Mexico
Germany
Germany and Costa Rica
Costa Rica
Natural Questions answer: Saudi Arabia
Russia (from the Wikipedia article "2018 FIFA World Cup")