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 "Prominently featured in the park is the World War I Memorial Carillon, built in 1926 as a memorial to those that died in the war." provide a valid answer to the question "What part of Richmond is Maymont close to?"

A: no

Does the sentence "And in 2004, the downtown area suffered extensive flood damage after the remnants of Hurricane Gaston dumped up to 12 inches (300 mm) of rainfall." provide a valid answer to the question "What hurricane hit Richmond in 2004?"

A: yes

Does the sentence "Anti-aircraft warfare or counter-air defence is defined by NATO as "all measures designed to nullify or reduce the effectiveness of hostile air action." provide a valid answer to the question "NATO defines anti-aircraft warfare as measures to reduce what?"

A:
yes