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.

Ex Input:
Question: How long had Ferdinand I been in power the year Coimbra fell? Passage:The history of the county of Portugal is traditionally dated from the reconquest of Portus Cale (Porto) by Vimara Peres in 868. He was named a count and given control of the frontier region between the Limia and Douro rivers by Alfonso III of Asturias. South of the Douro, another border county would be formed decades later when what would become the County of Coimbra was conquered from the Moors by Hermenegildo Guterres. This moved the frontier away from the southern bounds of the county of Portugal, but it was still subject to repeated campaigns from the Caliphate of Cordoba. The recapture of Coimbra by Almanzor in 987 again placed the County of Portugal on the southern frontier of the Leonese state for most of the rest of the first county's existence. The regions to its south were only again conquered in the reign of Ferdinand I of Leon and Castile, with Lamego falling in 1057, Viseu in 1058 and finally Coimbra in 1064.

Ex Output:
b

Ex Input:
Question: When was the firm that designed the Oregon library established? Passage:The Oregon Library was designed by Chicago architects Pond and Pond. The Ponds were members of the Eagle's Nest Art Colony, founded by Lorado Taft, and their association with Taft and the colony led them to design the library. Their design was influenced by the colony, and a combination of two architectural styles, Classical Revival and the Arts and Crafts movement. The completed library included a second floor art gallery to which members of Eagle's Nest donated works for a permanent collection. The gallery's collection includes 64 paintings and sculptures as well as a Currier and Ives lithograph collection appraised at US$700,000. The Oregon Public Library was listed on the U.S. National Register of Historic Places in 2003, three years later it was included as a contributing property in a historic district that received the National Register designation.

Ex Output:
a

Ex Input:
Question: Did VItaly Petrov win a race for Renault? Passage:In October 2004, the Midland Group announced its intention to enter Formula One motor racing in 2006, with plans to use a car built by the Italian manufacturer Dallara In January 2005 the group changed plans by purchasing the Jordan Grand Prix team. They kept the yellow-liveried EJ15 cars and declared 2005 to be a year of learning. Under the name Midland F1 Racing, the team made its debut with a brand-new car and livery at the start of the 2006 Formula One season. With this team, Shnaider declared his intention to bring the first Russian driver into the sport, a feat not achieved until Vitaly Petrov's entrance into F1 with Renault, three years after Schnaider sold the team. On 9 September 2006, the team was sold to Spyker Cars for $106.6 million. From the beginning of the 2008 season, the team became known as Force India and remained active until 2018, when a group of consortium led by Lawrence Stroll bought the team in 2018 following a financial collapse that forced Force India to be put under administration. The team currently competes under the Racing Point banner.

Ex Output:
b