Generate a correct and concise answer for the question based on the words in the context.

[EX Q]: Context : The QBZ-95 was first observed outside China on 1 July 1997, when the United Kingdom transferred the sovereignty of Hong Kong to the People's Republic of China. 
Question : What year was QBZ-95 commissioned?
[EX A]: 1997

[EX Q]: 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 : What was the year Sinclair Scientific entered service?
[EX A]: 1974

[EX Q]: Context : Eleanor Elkins Widener, née Eleanore Elkins (later known as Eleanor Elkins Widener Rice or Mrs. Alexander Hamilton Rice; c.1862 -- July 13, 1937) was an American heiress, socialite, philanthro­pist, and adventuress best remembered for her donation to Harvard University of the Widener Library--​a memorial to her elder son Harry Elkins Widener, who (along with her first husband, George Dunton Widener) perished in the sinking of the RMS Titanic. 
Question : What is Eleanor Elkins Widener's spouse's name?
[EX A]:
George Dunton Widener