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: What age was Robert I the year the Battle of Bannockburn occurred? Passage:Scottish field armies rarely managed to stand up to the usually larger and more professional armies produced by England, but they were used to good effect by Robert I of Scotland at the Battle of Bannockburn in 1314 to secure Scottish independence. He adopted a policy of slighting castles and made use of naval power to support his forces, beginning to develop a royal Scottish naval force. In the Late Middle Ages under the Stewart kings these forces were further augmented by specialist troops, particularly men-at-arms and archers, hired by bonds of manrent, similar to English indentures of the same period. New "livery and maintenance" castles were built to house these troops and castles began to be adapted to accommodate gunpowder weapons. The Stewarts also adopted major innovations in continental warfare, such as longer pikes, the extensive use of artillery, and they built up a formidable navy. However, one of the best armed and largest Scottish armies ever assembled still met with defeat at the hands of an English army at the Battle of Flodden in 1513, which saw the destruction of a large number of ordinary troops, a large section of the nobility and King James IV.
 Links: a. Royal Scots Navy b. Scotland in the Late Middle Ages c. Manrent d. Robert the Bruce
Example Output: d

Example Input: Question: Which country has the smaller land mass, Finland or Denmark? Passage:Sweden ( ), officially the Kingdom of Sweden ( ), is a country in Northern Europe. It borders Norway to the west and north and Finland to the east, and is connected to Denmark in the southwest by a bridge-tunnel across the Öresund Strait. At , Sweden is the largest country in Northern Europe, the third-largest country in the European Union and the fifth largest country in Europe by area. The capital city is Stockholm. Sweden has a total population of 10.3 million of which 2.5 million have a foreign background. Persons who have foreign backgrounds are defined as persons who are foreign born, or born in Sweden with foreign born parents. It has a low population density of and the highest urban concentration is in the central and southern half of the country.
 Links: a. Capital City b. Finland c. Finland d. Stockholm
Example Output: b

Example Input: Question: What is the current population of the country where Baker served during the Second Boer War?  Passage:Born on 13 December 1863, Arthur Slade Baker was educated at Bedford School. He received his first commission as a second lieutenant in the Royal Artillery in 1882, was promoted to the rank of lieutenant on 1 October 1882, to the rank of captain on 1 October 1891, and to the rank of major on 1 April 1900. He served during the Second Boer War in South Africa between 1900 and 1901. In June 1902 he was appointed as Inspector, General Stores division, of the Army Ordnance Department, serving at Woolwich until 1905. He was Deputy Assistant Director at the War Office between 1908 and 1912. He was promoted to the rank of Lieutenant Colonel in 1912. He served during the First World War, and was promoted to the rank of Brigadier General.
 Links: a. South Africa b. South Africa c. Woolwich d. South Africa
Example Output:
a