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: How many soldiers died in the battle that Stanley missed due to illness? Passage:He fought at several battles in Missouri, including the Battle of Wilson's Creek, where he guarded the supply trains. President Abraham Lincoln appointed Stanley as brigadier general September 28, 1861, although the U.S. Senate did not confirm the appointment until March 7, 1862. Fighting in the Western Theater, he participated in the operations against New Madrid, Missouri and the Battle of Island Number Ten. He was involved in numerous major battles, including the Second Battle of Corinth, where he commanded a division of infantry of the Army of the Mississippi, and the Battle of Stones River, in which he led the cavalry of the Army of the Cumberland. On March 11, 1863, Stanley was appointed major general to rank from November 29, 1862. Stanley also led the Union cavalry in the Tullahoma Campaign. He fell ill late in 1863 and missed the Battle of Chickamauga. In 1864, he fought under William Tecumseh Sherman as a division commander in the IV Corps of the Army of the Cumberland during the Atlanta Campaign, and he was promoted to command of the corps when Maj. Gen. Oliver O. Howard was named commander of the Army of the Tennessee. After the capture of the city, instead of employing him marching to the sea, Sherman dispatched Stanley and his IV Corps to Tennessee to help protect the state from invasion by John Bell Hood's Army of Tennessee.
Links: a. Army of Tennessee b. Missouri c. Battle of Chickamauga d. John Bell Hood
Example Output: c

Example Input: Question: Who fought in the Nagorno-Karabakh War? Passage:Aram Sarkissian (Simon Abkarian) is a young French-Armenian member of AGJSA, an Armenian militant organization, who leaves his family in Paris to fight in the Nagorno-Karabakh War. In October 1993, Aram returns to France to live a "normal life" again, but finds his younger brother Levon (Mathieu Demy) preparing the assassination of Azbalan Djelik, a general of the Turkish Army visiting France. Aram opposes the assassination, claiming the Armenian struggle lies in Nagorno-Karabakh, however, Levon considers Aram to be a coward, who then reluctantly agrees. One evening, General Djelik is killed when his car is ambushed by 3 masked gunmen, who shoot and kill three of the four passengers. The survivor, Djelik's aide-de-camp Colonel Talaat Sonlez (Serge Avedikian), shoots Levon after he pretended to be dead. Levon is immobilized and enters a coma, and Sonlez is shot by the Armenians before they flee. AGJSA claims responsibility for the attack, justifying it as General Djelik was a high-ranking member of the Black Wolves, a Turkish ultranationalist organization. Talaat survives again, and searches for the assassins by asking Monsieur Paul (Gilles Arbona), a French counter-terrorism policeman monitoring the activities of AGJSA, who does not reveal their identities.
Links: a. Counter-terrorism b. Militant c. Nagorno-Karabakh War d. Nagorno-Karabakh War
Example Output: c

Example Input: Question: What states did Waller receive doctorate degrees from, either earned or honorary? Passage:Waller was born on July 17, 1846. His parents were David Jewett Waller Sr. and Julia Ellmaker Waller. He was their fifth child. When young he was educated at Bloomsburg. After that he went to a classical school in a local Primitive Methodist Episcopal Church. When Waller was fourteen he was sent to a school run by Revered Gayley in the community of Media. In 1861, at the age of 15, he went to Williams College's preparatory department. However, due to sickness his education ceased for three years. In 1867, he was among the first people to graduate from the Bloomsburg Literary Institute. Waller went to Lafayette College in the autumn of 1867. He did well there and graduated from there with a Bachelor of Arts degree in 1870 and a Master of Arts degree in 1873. From 1870 to 1871 he trained to be and served as a tutor in Latin and Greek. While at Lafayette College he also won the Fowler Prize, a prize of $30 granted for excellence in English philology. Waller attended the Princeton Theological Seminary from 1871 to 1872, then switched to the Union Theological Seminary and graduated from that in 1874. He received an honorary Ph.D from Lafayette College in 1880 and received a Doctor of Divinity degree from Ursinus College in 1892. Juniata College granted Waller an honorary Doctor of Laws degree in 1934.
Links: a. David Jewett Waller Sr. b. Latin c. Doctor of Philosophy d. Media, Pennsylvania
Example Output:
c