Does the sentence "The treaty was signed by twelve countries including the Soviet Union (and later Russia), the United Kingdom, Argentina, Chile, Australia, and the United States." provide a valid answer to the question "How many countries signed the treaty protecting Antarctica from claims?"

A: yes

Does the sentence "After a 20-year hiatus, the station was shortly thereafter officially re-launched on April 4, 2011." provide a valid answer to the question "Howmany hours a day does SNTV broadcast?"

A: no

Does the sentence "In more recent applications, hydrogen is used pure or mixed with nitrogen (sometimes called forming gas) as a tracer gas for minute leak detection." provide a valid answer to the question "Why would one use hydrogen mixed with nitrogen?"

A: yes

Does the sentence "However at 17, Victoria, though interested in Albert, was not yet ready to marry." provide a valid answer to the question "Who was considered Victoria's best and kindest advisor?"

A:
no