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: How many years did the Pope serve that had instituted the Feast of Corpus Christi? Passage:The Mass at Bolsena, depicted in a famous fresco by Raphael at the Vatican in Rome, was an incident said to have taken place in 1263. A Bohemian priest who doubted the doctrine of transubstantiation, celebrated mass at Bolsena, a town north of Rome. During the mass the bread of the eucharist began to bleed. The blood from the host fell onto the altar linen in the shape of the face of Jesus as traditionally represented, and the priest came to believe. The following year, in 1264, Pope Urban IV instituted the Feast of Corpus Christi to celebrate this miraculous event. A gold-plated silver and enamel reliquary was made in 1337-1338 by Sienese goldsmith Ugolino di Vieri to house the relic. The blood-stained Corporal of Bolsena is still venerated as a major relic in Orvieto Cathedral in central Italy.


b