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.

Ex Input:
Question: How many people died in the incident that contaminated about 30,000 km?  Passage:Natural strontium is a mixture of four stable isotopes: Sr, Sr, Sr, and Sr. Their abundance increases with increasing mass number and the heaviest, Sr, makes up about 82.6% of all natural strontium, though the abundance varies due to the production of radiogenic Sr as the daughter of long-lived beta-decaying Rb. Of the unstable isotopes, the primary decay mode of the isotopes lighter than Sr is electron capture or positron emission to isotopes of rubidium, and that of the isotopes heavier than Sr is electron emission to isotopes of yttrium. Of special note are Sr and Sr. The former has a half-life of 50.6 days and is used to treat bone cancer due to strontium's chemical similarity and hence ability to replace calcium. While Sr (half-life 28.90 years) has been used similarly, it is also an isotope of concern in fallout from nuclear weapons and nuclear accidents due to its production as a fission product. Its presence in bones can cause bone cancer, cancer of nearby tissues, and leukemia. The 1986 Chernobyl nuclear accident contaminated about 30,000 km with greater than 10 kBq/m with Sr, which accounts for 5% of the core inventory of Sr.
 Links: a. Rubidium b. Mass number c. Electron capture d. Chernobyl disaster

Ex Output:
d


Ex Input:
Question: What was the innagural year of the awards ceremony that Nicholson was nominated for Best Motion Picture Actor – Drama? Passage:The Last Detail was nominated for the Palme d'Or at the 1974 Cannes Film Festival and Nicholson was awarded Best Actor. It was also nominated for three Academy Awards – Jack Nicholson for Best Actor in a Leading Role, Randy Quaid for Best Actor in a Supporting Role, and Robert Towne for Best Writing, Screenplay Based on Material from Another Medium with none of them winning. In addition, The Last Detail was nominated for two Golden Globes Awards – Nicholson for Best Motion Picture Actor – Drama and Quaid for Best Supporting Actor – Motion Picture. Nicholson did win a BAFTA award for his role in the film. Nicholson won the Best Actor awards from the National Society of Film Critics and the New York Film Critics Circle. However, he was disappointed that he failed to win an Oscar for his performance. "I like the idea of winning at Cannes with The Last Detail, but not getting our own Academy Award hurt real bad. I did it in that movie, that was my best role".
 Links: a. Golden Globe Awards b. Cannes Film Festival Award for Best Actor c. New York Film Critics Circle d. Golden Globe Award for Best Supporting Actor – Motion Picture

Ex Output:
a


Ex Input:
Question: Who did John Vincent Barry compete against in the election of 1943? Passage:In 1939, Barry joined the Australian Labor Party and ran, unsuccessfully, for the federal seat of Balaclava in the electoral year of 1943. However, he later became a member of the Victorian central executive in 1945–47, as well as becoming a member of the Overseas Telecommunications Commission in 1946-47. He was also elected chairman of the ethics committee of the Australian Journalists' Association, after becoming a member in 1943. Appointed as a King's Counsel (now known as the Senior Counsel) in 1942, Barry assisted Sir Charles Lowe in the inquiry into the Darwin air raids. Representing the politician, Eddie Ward in a royal commission into the Brisbane Line, Barry was appointed commissioner to investigate the suspension of government in Papua New Guinea.
 Links: a. Overseas Telecommunications Commission b. Politics of Australia c. Brisbane Line d. Politics of Australia

Ex Output:

b