With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Around this time Johann Bernoulli's two sons, Daniel and Nicolaus, were working at the Imperial Russian Academy of Sciences in Saint Petersburg. On 31 July 1726, Nicolaus died of appendicitis after spending less than a year in Russia. When Daniel assumed his brother's position in the mathematics/physics division, he recommended that the post in physiology that he had vacated be filled by his friend Euler. In November 1726 Euler eagerly accepted the offer, but he rescinded his acceptance while en route to Saint Petersburg, when he heard that he had been hired as a physics professor at the University of Basel
text_B: Given the outcome of the hiring process, would Euler be lecturing to his students in Russian?
NO.