Does the sentence "Guano (bird excrement) is harvested for use as a fertilizer." provide a valid answer to the question "What is guano?"

A: yes

Does the sentence "Tony Benn said that the Queen found Trudeau "rather disappointing"." provide a valid answer to the question "What did Trudeau say Elizabeth favored?"

A: no

Does the sentence "The photophone was a precursor to the fiber-optic communication systems which achieved popular worldwide usage in the 1980s." provide a valid answer to the question "In what decade did fiber-optics become widely used?"

A: yes

Does the sentence "The Ottoman Empire stood between the West and the East, thus blocking the land route eastward and forcing Spanish and Portuguese navigators to set sail in search of a new route to the Orient." provide a valid answer to the question "When did Christopher Columbus sail to the Bahamas?"

A:
no