context: Sergei Ivanovich Vavilov (1891 —1951) - Soviet, founder of the scientific school of physical optics in the USSR, full member (1932) and president of the USSR Academy of Sciences (1945-1951), public figure and popularizer of science [1]. The younger brother of N.I. Vavilov, a Soviet geneticist. Laureate of four Stalin Prizes.
question: What year was born Sergei Ivanovich Vavilov?
answers.text: 1891