instruction:
Generate a correct and concise answer for the question based on the words in the context.
question:
Context : The Sinclair Scientific calculator was a 12-function, pocket-sized scientific calculator introduced in 1974, dramatically undercutting in price other calculators available at the time. 
Question : In which year was the service entry date for Sinclair Scientific?
answer:
1974


question:
Context : John E. Hatley is a former Master Sergeant in the United States Army serving a 40-year sentence in the Fort Leavenworth Disciplinary Barracks for the murder of four Iraqi detainees. 
Question : Which crime John E. Hatley is considered to have commited?
answer:
murder


question:
Context : Ratko Periš (born 30 March 1976) is a retired Croatian male volleyball player. 
Question : What gender is Ratko Periš?
answer:

male