instruction:
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.
question:
Context: His father, Hamilton Fish Kean (1862–1941), was a United States Senator from New Jersey Link Information: His father, Hamilton Fish Kean (1862–1941), was a United States Senator from New Jersey Answer: a single six-year term
answer:
How many terms as a senator did  Robert Kean's father serve?


question:
Context: . In 2007, he returned to Macedonia and signed with Macedonian First League Link Information: none Answer: none
answer:
How many teams were in Macedonian First League?


question:
Context: He resumed driving for the team at the European Grand Prix and the following British Grand Prix. Link Information: none Answer: none
answer:

Of the Grand Prix that di Resta actually drove in, which had been in existence the longest?