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: What year was Casimir born? Passage:Wawel is a place of great significance to the Polish people: it first became a political power centre at the end of the first millennium AD and in the 9th century, the principal fortified castrum of the Vistulans tribe (). The first historical ruler Mieszko I of Poland (c.965–992) of the Piast dynasty and his successors: Boleslaw I the Brave (; 992–1025) and Mieszko II (1025–1034) chose Wawel to be one of their residences. At the same time Wawel became one of the principal Polish centres of Christianity. The first early Romanesque buildings were erected there including a stone cathedral serving the bishopric of Kraków in the year 1000. From the reign of Casimir the Restorer (1034–1058) Wawel became the leading political and administrative centre for the Polish State.


b