Q: Does "A tradeoff between cost and efficiency is possible.[citation needed]" provide a valid answer to "Is a tradeoff between efficiency and cost possible?"?
A: yes

Q: Does "Aside from the dockyard in the town of Devonport, industries in Plymouth such as the gasworks, the railways and tramways and a number of small chemical works had begun to develop in the 19th century, continuing into the 20th century." provide a valid answer to "What animal byproduct was imported to Plymouth in the 19th century?"?
A: no

Q: Does "Since he had agreed to share U.S. profits with his investors Gardiner Hubbard and Thomas Sanders, Bell requested that an associate in Ontario, George Brown, attempt to patent it in Britain, instructing his lawyers to apply for a patent in the U.S. only after they received word from Britain (Britain would issue patents only for discoveries not previously patented elsewhere)." provide a valid answer to "What did Bell promise to split with his financers?"?
A: yes

Q: Does "For example, there is a 3-station underground public elevator in Yalta, Ukraine, which takes passengers from the top of a hill above the Black Sea on which hotels are perched, to a tunnel located on the beach below." provide a valid answer to "What type of public elevator in Yalta, Ukraine, transport passengers from a hill above the Black Sea to a tunnel down on the beach?"?
A:
yes