Detailed Instructions: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
Q: This acronym maintains this, a nationwide network of libraries dedicated to preserving and making available the documents of U.S. presidents?, Context: NARA also maintains the Presidential Library system, a nationwide network of libraries for preserving and making available the documents of U.S. presidents since Herbert Hoover. The Presidential Libraries include:
A:
Presidential Library system