Read this and answer the question. If the question is unanswerable, say "unanswerable".

The United Nations Organization and its children's agency UNICEF withdrew their staff, saying that it wasn't sure the event would help its mission of raising awareness of conditions for children and amid concerns that the relay would be used as a propaganda stunt. "It was unconscionable," said a UN official who was briefed on the arguments. North Korea is frequently listed among the world's worst offenders against human rights.

North Korea is often listed among the worst offenders in the world in what regard?
against human rights.