Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Context: Sir Balan le Savage, brother of Sir Balin from Northumberland, is a minor character mentioned in various Arthurian legends. 
 Question: Who was the brother of Sir Balan?
sir balin

Context: Paul MacEwan (born April 8, 1943) is a former politician in Cape Breton Island, Nova Scotia, Canada, and long-time member of the Nova Scotia House of Assembly. 
 Question: What is the position of Paul MacEwan?
member of the nova scotia house of assembly

Context: The United States Exploring Expedition was an exploring and surveying expedition of the Pacific Ocean and surrounding lands conducted by the United States from 1838 to 1842. 
 Question: On what date did United States Exploring Expedition end?

1842