Definition: In this task, you're given a question, along with a context passage. The passage will not have a direct answer to the question, but can include some information and a clue for the answer. Assuming you can only obtain information about one entity in the passage, your job is to determine whether information from the passage can be used to answer the question. Indicate your choice as `a` for Yes or `b` for No.
Input: Question: Who was the wife of the ruler that Vasiliy Buturlin was a representative of when he had a meeting with the Zaporozhian Cossacks? Passage:At a meeting between the council of Zaporozhian Cossacks and Vasiliy Buturlin, representative of Tsar Alexey I of the Tsardom of Russia, during the Khmelnytsky Uprising. The "Pereyaslav Council" (Pereyaslavs'ka Rada in Ukrainian) of Ukrainians took place on January 18; it was meant to act as the supreme Cossack council and demonstrate the unity and determination of the "Rus' nation". Military leaders and representatives of regiments, nobles and townspeople listened to the speech by the Cossack hetman Bohdan Khmelnytsky, who expounded the necessity of seeking the Russian protection. The audience responded with applause and consent. The treaty, initiated with Buturlin later on the same day, invoked only protection of the Cossack state by the Tsar and was intended as an act of official separation of Ukraine from the Polish–Lithuanian Commonwealth (Ukrainian independence had been informally declared earlier in the course of the Uprising by Khmelnytsky). Participants in the preparation of the treaty at Pereyaslav included, besides Khmelnytsky, Chief Scribe Ivan Vyhovsky and numerous other Cossack elders, as well as a large visiting contingent from Russia.


b