In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Input: Consider Input: Question: Which of Messner's teachers at the University of Munich was older? Passage:After Meissner’s abitur at the Humanistisches Gymnasium, in 1910, he began the study of physics and mathematics at University of Tübingen. After three terms, he went to the University of Munich as a student of the experimentalist Wilhelm Röntgen and the theoretician Arnold Sommerfeld. After one year at Munich, he returned to Tübingen to be able to study spectroscopy with Friedrich Paschen. While still a student in 1914, Meissner was able to prove the existence of oxygen lines in the solar spectrum. He was awarded his doctorate in 1915, on a thesis with the title Interferometrische Wellenlängenbestimmung im infraroten Spektralbereich. In 1916 he became an assistant to Edgar Meyer at the University of Zurich, under whom he completed his Habilitation, in 1918, with the Habilitationsschrift title Untersuchungen des Neonspektrums. The following year, he married the Polish physicist Doctor Janka Kohn.
 Links: a. Habilitation b. Ludwig Maximilian University of Munich c. University of Tübingen d. Wilhelm Röntgen

Output: d


Input: Consider Input: Question: Which of Eugenio's cousins in the first degree reigned longer with their respective titles? Passage:In addition to being a cousin in the first degree of Victor Amadeus III of Sardinia and of Louis Joseph of Bourbon, Prince de Condé, Eugènio's sister Maria Teresa (1749-1792) had married Louis Alexandre de Bourbon, Prince de Lamballe, the heir of a legitimised branch of the French royal family when he was 13, and had become the close friend and Surintendante of the French queen, Marie Antoinette of Austria, by 1775. As his elder brother, Victor Amadeus, was heir to the Carignano princedom, the traditional occupations for a younger son of a princely house, an episcopal or military sinecure, beckoned him to the French court. Upon reaching adulthood, he assumed a family title, Count of Villafranca, and obtained a commission in the French army service as proprietary colonel of the Villefranche Regiment, and was known there as "Prince Eugène, comte de Villefranche".
 Links: a. Victor Amadeus III of Sardinia b. Legitimation c. Sinecure d. Victor Amadeus III of Sardinia

Output: a


Input: Consider Input: Question: How many active TikTok users were there the year Old Town Road entered the Billboard charts? Passage:The song initially gained popularity on social video sharing app TikTok and eventually entered the Billboard charts in March 2019. The song reached number 19 on the Billboard Hot Country Songs chart before the magazine disqualified it from being included on the chart on grounds that it did not fit the genre, sparking a debate on the definition of country music. Though the song was not re-entered onto the overall country charts, both the original version of the song and the remix featuring Cyrus eventually peaked at number one on the flagship Billboard chart, the Hot 100, for a record-breaking nineteen consecutive weeks. Internationally, one or more versions of "Old Town Road" have topped the national singles charts in Australia, Canada, France, Germany, Ireland, the Netherlands, New Zealand, Norway, Switzerland, and the United Kingdom; and charted within the top ten in various other markets. Furthermore, the song was awarded diamond certification by the RIAA, in October 2019, for moving ten million total units in the United States, the fastest song to be awarded diamond certification. The remix of "Old Town Road" featuring Billy Ray Cyrus has been nominated for Record of the Year and Best Pop Duo/Group Performance at the 62nd Annual Grammy Awards, with its music video receiving a nomination for Best Music Video.
 Links: a. Grammy Award for Best Pop Duo/Group Performance b. List of Billboard Hot 100 chart achievements and milestones c. Grammy Award for Best Pop Duo/Group Performance d. TikTok


Output: d