Does "Melatonin is absent from the system or undetectably low during daytime." contain the correct answer to "At its onset, what can be measured in blood or saliva?"

A: yes

Does "There have been at least 16 royal weddings at the abbey since 1100." contain the correct answer to "Which two reigning monarchs had weddings at the abbey?"

A: no

Does "Defensive Counterair (DCA) is defined as "all the defensive measures designed to detect, identify, intercept, and destroy or negate enemy forces attempting to penetrate or attack through friendly airspace" (JP 1-02)." contain the correct answer to "What does the abbreviation DCA stand for?"

A:
yes