Definition: In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it, i.e., the proper nouns in the passage. Your job is to determine whether information from more than one term is needed to answer the question. Indicate your choice as `a` for Yes or `b` for No.
Input: Question: Of the last two Ruthenian kings were joint rulers, which was the oldest? Passage:The Romanoviches (Izyaslavichi of Volhynia)were the line of Roman the Great, descended from Mstislav I of Kiev through his son Iziaslav II of Kiev and his grandson Mstislav II of Kiev, father of Roman the Great. The older Monomakhovychi line that ruled Principality of Volhynia, they were eventually crowned kings of Galicia and Volhynia and ruled until 1323. Romanovychi displaced the older line of Izyaslavychi from Turov and Volhynia as well as Rostyslavychi from Galicia. The last were two brothers of Romanovychi, Andrew and Lev II, who ruled jointly and were slain trying to repel Mongol incursions. The Polish king, Władysław I the Elbow-high, in his letter to the Pope wrote with regret: "The two last Ruthenian kings, that had been firm shields for Poland from the Tatars, left this world and after their death Poland is directly under Tatar threat." Losing their leadership role, Rurikids, however, continued to play a vital role in the Grand Duchy of Lithuania and the later Polish-Lithuanian Commonwealth. Most notably, the Ostrogski family held the title of Grand Hetman of Lithuania and strove to preserve the Ruthenian language and Eastern Orthodoxy in this part of Europe. It is thought that the Drutsk and related princely families may also descend from Roman the Great.


a