Problem: Does "However, before this type of LED can play a role on the market, several technical problems must be solved." answer the question "What problem must be solved before multi-color LEDs can play a role in the market?"

A: no

Problem: Does "On January 7, 2012, Beyonce gave birth to a daughter, Blue Ivy Carter, at Lenox Hill Hospital in New York under heavy security." answer the question "What did Beyonce and Jay Z name their daughter?"

A: yes

Problem: Does "The commander of 2 Canadian Air Division is responsible for training and support functions." answer the question "Who reports to the operational commander about the wings?"

A:
no