King Willem-Alexander is Dutch head of State and Rob Jetten is Prime Minister
Background
The Royal House of the Netherlands records that King Willem-Alexander has been head of State since 30 April 2013. The Netherlands has been a constitutional monarchy since 1814. The King together with the ministers forms the government, and as head of State he falls under ministerial responsibility. The head of government is the Prime Minister, who is also Minister of General Affairs. The Dutch government's own page names Rob Jetten of Democrats 66 in that office.
Head of State:
King Willem-Alexander
Head of State since:
30 April 2013
Prime Minister:
Rob Jetten
Constitutional monarchy since:
1814
Why it matters for exams: Head of State and head of government for a monarchy is a classic two-part objective question.
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In plain words
Minister of General Affairs Minister van Algemene Zaken — The portfolio held by the Dutch Prime Minister.