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.

Example Input: Question: How old were Norman Tindale and Joseph Birdsell when they published their paper about the 12 Negrito tribes? Passage:In a publication of 1941, Norman Tindale, together with the American anthropologist Joseph Birdsell, published a paper suggesting that there were 12 Negrito tribes living on the coastal and rainforest areas around Cairns. The idea had been developed by Birdsell during field work in 1937-8. They were characterized by very short stature, curly hair, and yellowy-brown skin. Six of them were Dyirbal speakers, such as the Jirrbal, Girramay, Gulngai and Djiru within the Murray Upper/Tully Area. Of the others, located further north beyond Cairns, two spoke varieties of Djabugay, and three spoke dialects of Yidin. The remaining tribe were the Mbabaram, whom Tindale took to be strong evidence for his hypothesis because their language, in so far as it had been reported, diverged substantially from the surrounding tongues, and appeared to be wholly atypical, compared to the standard Australian aboriginal languages.

Example Output: b

Example Input: Question: What year did Eisner's "Mad Dog" ad for Zima originally air? Passage:Eisner had used some of Digital Domain's processors to render images for his film, and the company suggested he meet with some commercial production houses. Thus began his career as a director of commercials, and after only a year-and-a-half, Eisner had directed 14 high-profile spots. His first commercial was Budweiser's Powersurge, which aired during the 1997 Super Bowl. He also took the helm for Rold Gold pretzels' "Comrades" starring Jason Alexander, which featured Pretzel Boy on a rescue mission to the Mir space station. Eisner's two anti-smoking spots for the California Department of Health Services, "Gala Event" and "Funeral", were selected as Best Spots in back-to-back issues of Adweek. In addition, Eisner's "Mad Dog" for Coors's Zima aired during the Seinfeld finale and was chosen by USA Today "Ad Meter" as the #1 spot. He has also done commercials for Sony, Sega and Coca-Cola.

Example Output: b

Example Input: Question: How many people can Stamford Bridge hold at max capacity? Passage:The quarter-final draw also determined the teams' routes to the final, with Barcelona facing the prospect of meeting either Chelsea or Liverpool in the semi-finals. After a 3–1 win at Anfield, Chelsea qualified for the semi-finals with a 4–4 draw at Stamford Bridge. The semi-final first leg was played at the Camp Nou; although Barcelona enjoyed the majority of the possession, Chelsea's defence was resolute and they became the first side to keep a clean sheet in Barcelona in this season's competition, coming away with a goalless draw. Barcelona needed to avoid defeat to reach the final, but they found themselves a goal down within 10 minutes; after they failed to clear Frank Lampard's pass into the penalty area, Michael Essien fired a left-footed volley past Víctor Valdés into the roof of the net. The rest of the match continued much the same as the first leg, with Barcelona retaining most of the possession. Despite this, they found themselves guilty of several fouls, while Chelsea made four unsuccessful penalty appeals during the match. Meanwhile, Dani Alves received his third yellow card of the knockout phase, ruling him out of Barcelona's next match, and Eric Abidal was given a straight red card for a foul on Nicolas Anelka as the French forward was through on goal. However, television replays after the incident showed that there was little contact between Abidal and Anelka. Norwegian referee Tom Henning Øvrebø allowed a minimum of four minutes of injury time at the end of the second half; in the third of those four minutes – just when it looked like Chelsea were about to secure a repeat of the 2008 final – Messi played the ball across the edge of the penalty area to Andrés Iniesta, who shot just past Petr Čech's outstretched hand for the away goal that would send Barcelona to the final.

Example Output:
b