Task: Explanation
Input (English): John Stewart, Earl of Mar and Garioch (c. 1456–c. 1479) was the youngest surviving son of James II of Scotland and Mary of Guelders. Question: Who was the wife of the king of the Scots who was assassinated on 21 February 1437? Answer: Mary of Guelders
Output (English): John Stewart, Earl of Mar and Garioch c. 1456–c. 1479 was the youngest surviving son of James II of Scotland and Mary of Guelders.