Teacher:Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
Teacher: Now, understand the problem? Solve this instance: Context : Friedrich Clemens Gerke Tower is a 230 metre tall telecommunication tower of reinforced concrete in Cuxhaven in Germany.
Answer : concrete
Student:
What material was used for Friedrich Clemens Gerke Tower?