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.

Q: Context: Davis sailed for San Francisco, California, around Cape Horn in 1852 Link Information: By 1890, San Francisco's population approached 300,000 Answer: approached 300,000

A: How many people lived in San Francisco the year Davis embarked on his journey to the city?
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Q: Context: Ripley's Believe It or Not! is the name of several documentary television series based on the newspaper feature. The first series aired on NBC from 1949 to 1950 Link Information: none Answer: none

A: How much money did NBC make the first year Ripley's Believe It or Not! aired on the network?
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Q: Context: The BBC televised the final again shown on Grandstand and with Ted Lowe commentating the match. Link Information: Britain's first live public broadcast was made from the factory of Marconi's Wireless Telegraph Company in Chelmsford in June 1920. Answer: 1920

A:
When did the network that televised the final again shown on Grandstand and with Ted Lowe first begin broadcasting?
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