Answer the following question: Formulate an answer to this elaborate question: Shudo Higashinakano ( , Higashinakano Shudo , born October 19, 1947) is a Japanese historian, He is a professor of intellectual history at Asia University who maintains that which titled event, an episode of mass murder and mass rape committed by Japanese troops against the residents of Nanjing, is a hoax?
Answer:
Nanking Massacre