In this task, you're given a context, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both context and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the context or linked information.

Context: When Harry Truman became president in April 1945, upon FDR's death, the vice presidency Link Information: As such Truman selected Alben Barkley of Kentucky as his running mate in the 1948 presidential election. When Democrats regained control as a result of the 1948 elections, Answer: 8
How many years was Harry Truman president?

Context: After a series of co-starring film roles, Lopez had her breakthrough when she was cast in the title role of Selena (1997), a biographical film about American singer-songwriter Selena Quintanilla-Pérez Link Information: 

Selena Quintanilla-Pérez (; April 16, 1971 – March 31, 1995) Answer: 2
How long after her death did the movie about Selena come out?

Context: In the 1830s, these two groups faced off in the First Carlist War, which the Cristinos won. The terms of surrender—notably the Convention of Vergara Link Information: In the 1830s, these two groups faced off in the First Carlist War, which the Cristinos won. The terms of surrender—notably the Convention of Vergara Answer: 6

How many years after the war began in the 1830s was the terms of surrender signed?