Does the sentence "The State Council declared a three-day period of national mourning for the quake victims starting from May 19, 2008; the PRC's National Flag and Regional Flags of Hong Kong and Macau Special Administrative Regions flown at half mast." provide a valid answer to the question "How long was the national mourning for the quake victims to last?"

A: yes

Does the sentence "Since the 19th century, a large proportion of Muslim peoples from the Balkans emigrated to present-day Turkey." provide a valid answer to the question "In what year did the Ottoman Empire end?"

A: no

Does the sentence "No seat is available on the main floor, so by invitation of Rev. Sykes, Jem, Scout, and Dill watch from the colored balcony." provide a valid answer to the question "Where do Jem, Scout, and Dill observe the trial of Tom Robinson?"

A: yes

Does the sentence "The Prussian army was unique in Europe for having the only such organisation in existence, whose purpose in peacetime was to prepare the overall war strategy, and in wartime to direct operational movement and organise logistics and communications." provide a valid answer to the question "The officers of the General Staff were hand-selected from which place?"

A:
no