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.

Example Input: Question: During what years was the Early Bronze Age? Passage:Iran is home to one of the world's oldest continuous major civilizations, with historical and urban settlements dating back to 7000 BC. The south-western and western part of the Iranian Plateau participated in the traditional Ancient Near East with Elam, from the Early Bronze Age, and later with various other peoples, such as the Kassites, Mannaeans, and Gutians. Georg Wilhelm Friedrich Hegel calls the Persians the "first Historical People". The Medes unified Iran as a nation and empire in 625 BC. The Achaemenid Empire (550–330 BC), founded by Cyrus the Great, was the first true global superpower state and it ruled from the Balkans to North Africa and also Central Asia, spanning three continents, from their seat of power in Persis (Persepolis). It was the largest empire yet seen and the first world empire. The Achaemenid Empire was the only civilization in all of history to connect over 40% of the global population, accounting for approximately 49.4 million of the world's 112.4 million people in around 480 BC. They were succeeded by the Seleucid, Parthian, and Sasanian Empires, who successively governed Iran for almost 1,000 years and made Iran once again as a leading power in the world. Persia's arch-rival was the Roman Empire and its successor, the Byzantine Empire.
 Links: a. Bronze Age b. Cyrus the Great c. Persepolis d. Central Asia
Example Output: a

Example Input: Question: How old is the producer of Viewtiful Joe? Passage:Viewtiful Joe is a 2.5D side-scrolling action-platformer, released on June 26, 2003. The title character is a parody of tokusatsu superheroes and is trying to save his girlfriend, who has been trapped in "Movieland" by a group of supervillains known as Jadow. To complete his quest, Joe must use his Viewtiful Effects Powers, which are based on camera tricks and special effects used in films. These include "Slow", which simulates bullet time; "Mach Speed", allowing Joe to attack all enemies with his afterimages; and "Zoom In", which triggers a camera close-up and unlocks special attacks. Internally, Capcom treated the game as a "staff-focused project" with the goal of increasing the skills of director Hideki Kamiya. The game achieved a Metacritic score of 93 and won GameCube Game of the Year awards from numerous publications including IGN, GMR, and USA Today. The game sold out its initial shipment of 100,000 to achieve a lifetime total of 275,000 units. Producer Atsushi Inaba considered the game a success, achieving his goals of training staff, keeping a small budget, and selling well. However, these numbers were lower than Capcom expected, prompting the publisher to port Viewtiful Joe to PlayStation 2 in 2004, with expanded features. This version sold 46,000 copies with a slightly lower Metacritic score of 90 owing to the lack of progressive scan and frame rate slowdown generated by the porting process.
 Links: a. Frame rate b. Hideki Kamiya c. Hideki Kamiya d. Atsushi Inaba
Example Output: d

Example Input: Question: When was the newspaper founded that Davies joined in July 1979? Passage:Davies gained a PPE degree from Oxford University in 1974, and started his journalism career in 1976, working as a trainee for the Mirror Group in Plymouth. He then moved to London initially to work for the Sunday People and spent a year working for The Evening Standard before becoming a news reporter at The Guardian in July 1979. Since then he has worked as home affairs correspondent at The Observer; chief feature writer at London Daily News in 1986 and on-screen reporter for World in Action and Channel 4's Dispatches. After the London Daily News folded he moved to the United States for a year, where he wrote White Lies, about the wrongful conviction of a black janitor, Clarence Brandley, for the murder of a white girl. From 1989 Davies was a freelance reporter for The Guardian, for which contributed articles, working from his home in Sussex. He was the winner of the first Martha Gellhorn Prize for Journalism in 1999. In September 2016 he retired, announcing that he would travel in search of interesting experiences. His website states he was last seen somewhere between a yoga shala in Indonesia and a cattle ranch in northern Argentina.
 Links: a. Clarence Brandley b. Dispatches (TV programme) c. The Guardian d. Channel 4
Example Output:
c