Does the sentence "The first high-brightness blue LED was demonstrated by Shuji Nakamura of Nichia Corporation in 1994 and was based on InGaN." provide a valid answer to the question "What substance did Barbieri use in his work with high-brightness LED?"

A: no

Does the sentence "The strongest advocates of European federalism have been Germany, Italy, Belgium and Luxembourg while those historically most strongly opposed have been the United Kingdom, Denmark and France (with conservative presidents and governments)." provide a valid answer to the question "Who is the strongest advocate of the European Federalism?"

A: yes

Does the sentence "Nelson's Column is a nationally recognised monument in Trafalgar Square, one of the focal points of central London." provide a valid answer to the question "The Monument, located in the City of London, was erected to commemorate what event?"

A: no

Does the sentence "However, palace eunuch Sun Cheng (d. 132 AD) masterminded a successful overthrow of her regime to enthrone Emperor Shun of Han (r. 125144 AD)." provide a valid answer to the question "Which person plotted to overthrew the regime of Empress Dowager Yan?"

A:
yes