question:
Nelson's Column is a nationally recognised monument in Trafalgar Square, one of the focal points of central London.
What famous monument is located in Trafalgar Square?

answer: yes

question:
During the Reagan administration, the United States regarded him as "Public Enemy No. 1" and Reagan famously dubbed him the "mad dog of the Middle East".
What did Reagan call Gaddafi?

answer: yes

question:
In 1911 arsphenamine, the first synthetic anti-infective drug, was developed by Paul Ehrlich and chemist Alfred Bertheim of the Institute of Experimental Therapy in Berlin.
Who developed Arsphenamine?

answer: yes

question:
In the same lecture, he further explained that antiparticles must exist, for if particles had only positive energies, they would not be restricted to a so-called "light cone".
In a lecture, Feynman said that what had to exist?

answer:
yes