Task: Question Generation
Input (English): Context : The Type 97 motorcycle, or Rikuo, was a copy of a Harley-Davidson motorcycle produced from 1935 in Japan under license from Harley-Davidson by the Sankyo Company (later Rikuo Nainen Company). 
Subject : Type 97 motorcycle 
Relation : service entry
Output (English): What was the year Type 97 motorcycle entered service?