Generate a correct and concise answer for the question based on the words in the context.
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Question: Context : The Stafford by-election, 1984 was a parliamentary by-election held on 3 May 1984 for the British House of Commons constituency of Stafford. 
Question : What date is associated with Stafford by-election, 1984?

Answer: 3 May 1984


Question: Context : The King's Commissioner of North Holland is Johan Remkes. 
Question : Which person was the head of government of North Holland?

Answer: Johan Remkes


Question: Context : SPB Software, a division of Yandex, the leading Russian IT company which operates the largest search engine in Russia, develops mobile solutions for OEM mobile device manufacturers, mobile carriers, smartphone, tablet, and end users worldwide. 
Question : Which company is the parent company of SPB Software?

Answer:
Yandex