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 the party to which Fitch was awarded membership in 1951 been in operation at the time? Passage:In 1950, Fitch raced his Ford Flathead engined Fiat 1100, which he soon modified into the "Fitch Model B", and ended the year by driving a Jaguar XK120 in the Sebring Grand Prix of Endurance Six Hours. In 1951, in addition to campaigning in his Fitch-Whitmore, he boosted his early reputation by winning the Gran Premio de Eva Duarte Peron Sport in his Allard-Cadillac J2. As a result of that win, Juan Peron generously awarded him membership in the Justicialist Party, whilst the trophy and a kiss were given by Eva Peron. He also clinched the support of Cunningham, whose financial clout allowed Fitch to race. He was drove a Cunningham C-2 for the Cunningham team at several races, including the 1951 24 Hours of Le Mans, scoring a number of impressive victories in the early '50s at then-fledgling road courses like Elkhart Lake and Watkins Glen, and was crowned the first SCCA National Sports Car Champion. In 1951, John raced an Effyh Formula Three car, winning at Bridgehampton and a class win at Giants Despair.

Ex Output:
b

Ex Input:
Question: Which North American city hall building that used Superblocks was completed first? Passage:Superblocks are also used when functional units such as rail yards or shipyards, inherited from the 19th and early 20th centuries, are too big to fit in an average city block. A contemporary function which reflects ancient practices that also requires larger than typical blocks is the sports stadium or arena. Just as the Colosseum in ancient Rome, sports complexes require superblocks. The Providence Park stadium in Portland, for example, takes up four normal city blocks as does the equally large Greensboro Coliseum in North Carolina. Other contemporary institutions, establishments or functions that use superblocks are: city halls like Government Center, Boston and Toronto City Hall; regional general hospitals or specialized medical centres; convention and exhibition centers, such as Exhibition Place in Toronto and the Boston Convention and Exhibition Center; and downtown enclosed Shopping Malls such as Eaton Centre in Toronto, echoing the large gallerias of the 19th century. Cultural complexes, such as the Lincoln Center in New York City, often occupy a superblock achieved through the consolidation of regular city blocks. A recent superblock user is the merchandise distribution centre, which can range in area from one to ten city blocks.

Ex Output:
a

Ex Input:
Question: Which part of the body can lymph nodes be found in? Passage:Diagnosis of MCC begins with a clinical examination of the skin and lymph nodes. Following, definitive diagnosis of Merkel cell carcinoma (MCC) requires examination of biopsy tissue to identify its histopathologic features. An ideal biopsy specimen is either a punch biopsy or a full-thickness incisional biopsy of the skin including full-thickness dermis and subcutaneous fat. On light microscopy, MCC shows basaloid tumor nests with neuroendocrine features ("salt and pepper" chromatin, scarce cytoplasm, and brisk mitotic activity). In addition to standard examination under light microscopy, immunohistochemistry (IHC) is also generally required to differentiate MCC from other morphologically similar tumors such as small cell lung cancer, the small cell variant of melanoma, various cutaneous leukemic/lymphoid neoplasms, and Ewing's sarcoma. Similarly, most experts recommend longitudinal imaging of the chest, typically a CT scan, to rule out that the possibility that the skin lesion is a skin metastasis of an underlying small cell carcinoma of the lung. Once an MCC diagnosis is made, a sentinel lymph node biopsy is recommended as a part of the staging work-up needed to determine prognosis and subsequent treatment options.

Ex Output:
b