Teacher:Generate a correct and concise answer for the question based on the words in the context.
Teacher: Now, understand the problem? Solve this instance: Context : Rudolf Trenkel (17 January 1918 -- 26 April 2001) was a German World War II Luftwaffe 138 victories Flying ace and recipient of the coveted Knight's Cross of the Iron Cross (German: Ritterkreuz des Eisernen Kreuzes).
Question : What was the award received by Rudolf Trenkel?
Student:
Knight's Cross of the Iron Cross