Does "Roughly 150 Tucson companies are involved in the design and manufacture of optics and optoelectronics systems, earning Tucson the nickname "Optics Valley"." contain the correct answer to "How many optics-related companies are in Tucson?"

A: yes

Does "In 1955, Mercury began three-channel stereo recordings, still based on the principle of the single microphone." contain the correct answer to "In which year did Mercury begin 3 channel stereo recording?"

A: yes

Does "Possibly the best preserved of them is the ensemble of the Tomb of Xiao Xiu" contain the correct answer to "Which piece is the best, in terms of preservation condition?"

A:
yes