Does the sentence "As the centre of Australia's "rust belt", Melbourne experienced an economic downturn between 1989 to 1992, following the collapse of several local financial institutions." provide a valid answer to the question "During which years did Melbourne experience an economic downturn?"

A: yes

Does the sentence "Loans to Armenia since 1993 exceed $1.1 billion." provide a valid answer to the question "How much in loans has Armenia received since 1993?"

A: yes

Does the sentence "By analogy with the photon, which has spin 1, he investigated the consequences of a free massless spin 2 field, and derived the Einstein field equation of general relativity, but little more." provide a valid answer to the question "Which parts of the Yang-Mills theories did Feynman help explain?"

A: no

Does the sentence "Tucson is the second-largest populated city in Arizona behind Phoenix, both of which anchor the Arizona Sun Corridor." provide a valid answer to the question "What nickname does Tuscon have because of their many companies involved in optics?"

A:
no