Does the sentence "No major mental health professional organization has sanctioned efforts to change sexual orientation and virtually all of them have adopted policy statements cautioning the profession and the public about treatments that purport to change sexual orientation." provide a valid answer to the question "What do these policy statements suggest?"

A: yes

Does the sentence "The University Library contains over 4.9 million volumes, 4.6 million microforms, and almost 99,000 periodicals making it (by volume) the 30th-largest university library in North America and the 10th-largest library among private universities." provide a valid answer to the question "How does the University Library rank among North American university libraries?"

A: yes

Does the sentence "Elizabeth and Philip were married on 20 November 1947 at Westminster Abbey." provide a valid answer to the question "When were Elizabeth and Philip married?"

A: yes

Does the sentence "The causes of the Franco-Prussian War are deeply rooted in the events surrounding the unification of Germany." provide a valid answer to the question "What are the causes of the Franco-Prussian War deeply rooted in?"

A:
yes