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: In what country did Dessay perform a joint cocnert with Jonas Kaufmann? Passage:The year 2007 saw Dessay premiering Laurent Pelly's production of La fille du régiment at the London Royal Opera House in January and the Vienna State Opera in April. She performed the title role in Manon at the Liceu in Barcelona in June/July and opened the season at the Metropolitan Opera in the new Mary Zimmerman production of Lucia di Lammermoor. She returned in the same season to sing Lucia again and subsequently reprised in Pelly's production of La fille du régiment. She went on performing Lucia at the San Francisco Opera and a joint concert with tenor Jonas Kaufmann at Le Corum in Montpellier as part of the Festival de Radio France et Montpellier. In October, she sang Manon at the Lyric Opera of Chicago.


a