TASK DEFINITION: Generate a correct and concise answer for the question based on the words in the context.
PROBLEM: Context : He was the father of Emmett Louis Till, whose murder in 1955 at the age of 14 galvanized the African-American civil rights movement.
Question : Which crime led to the conviction of Louis Till?

SOLUTION: murder

PROBLEM: Context : M. Waldo Hatler (January 6, 1894 - August 31, 1967) was a Sergeant in the United States Army during World War I who received the Medal of Honor for heroism near Pouilly, France, November 8, 1918.
Question : In what war was M. Waldo Hatler a combatant?

SOLUTION: World War I

PROBLEM: 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 : Which was the official year for the approval of Sinclair Scientific?

SOLUTION:
1974