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: Which two countries did Crusoe visit before he arrived back in London? Passage:Argun was the first town on the Russian border; then they went through Nertzinskoi (Nerchinsk), Plotbus, touched a lake called Schaks Ozer, Jerawena, the river Udda, Yeniseysk, and Tobolsk (from September 1703 to beginning of June 1704). They arrived in Europe around the source of the river Wirtska, south of the river Petrou, in a village called Kermazinskoy near Soloy Kamskoy (Solikamsk). They passed a little river called Kirtza, near Ozomoys (or Gzomoys), came to Veuslima (?) on the river Witzogda (Vychegda), running into the Dwina, then they stayed in Lawrenskoy (3–7 July 1704; possibly Yarensk, known as Yerenskoy Gorodok at that time). Finally Crusoe arrived at the White Sea port town Arch-Angel (Archangelsk) on 18 August, sailed into Hamburg (18 September), and Hague. He arrived at London on 10 January 1705, having been gone from England ten years and nine months.


a