In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

[EX Q]: Passage: Barton Stone Alexander (September 4, 1819 – December 15, 1878) was a Union Army lieutenant colonel, engineer regiment commander and chief engineer for the defenses of Washington during the American Civil War. In recognition of his service, in 1866, he was appointed to the brevet rank of brigadier general in the regular army, to rank from March 13, 1865. He was a graduate of the U.S. Military Academy at West Point and served in the United States Army's Corps of Topographical Engineers, which at times was both a part of and separate from the United States Army Corps of Engineers. After graduating from West Point as a second lieutenant in the Class of 1842, he served in the Mexican–American War, building fortifications to protect American supply lines in the advance on Mexico City. After the end of the war, he was stationed in Washington, D.C., where he served as architect for the Scott Building and Quarters Buildings at the U.S. Soldiers' Home and took over the completion of the Smithsonian Institution Building after dissatisfaction with the pace of the first architect caused him to be dismissed.
 Link Information:  Approximately 1,300 cadets enter the Academy each July, Question: How many people are admitted each year to the educational facility Barton graduated from?
[EX A]: Answer: 1,300 

[EX Q]: Passage: Finley's early recordings featured her ranting provocative monologues over disco beats (and she would often perform her songs late night at Danceteria, where she worked). These recordings include the singles "Tales of Taboo" from 1986 and "Lick It" from 1988 (both produced by Madonna collaborator Mark Kamins) plus the 1988 album The Truth Is Hard to Swallow. She collaborated with Sinéad O'Connor on a remix of O'Connor's song "Jump in the River," and was prominently sampled by S'Express on the classic dance floor cut-up, "Theme from S-Express" (her vocal - sampled from "Tales of Taboo" - exclaimed, "Drop that ghettoblaster!"). She was notably one of the NEA Four, four performance artists whose grants from the National Endowment for the Arts were vetoed in 1990 by John Frohnmayer after the process was condemned by Senator Jesse Helms under "decency" issues. In 1991, she created the Memento Mori installation in Newcastle upon Tyne, as part of the Burning the Flag? festival examining American live art and censorship. Finley also played Tom Hanks' character's doctor in the movie Philadelphia at the invitation of Director Jonathan Demme.
 Link Information: Another hit he signed around the same time was “Jam Hot" (1983), by then DJ Johnny Dynell. Question: Who else did Mark Kamins collaborate with besides Madonna and Karen Finley?
[EX A]: Answer: DJ Johnny Dynell

[EX Q]: Passage: Darius was the son of Hystaspes and the grandson of Arsames. Both men belonged to the Achaemenid tribe and were still alive when Darius ascended the throne. Darius justifies his ascension to the throne with his lineage. He claimed he could trace his ancestors back to Achaemenes, even though he was only distantly related. With this in mind, Darius married Atossa, daughter of Cyrus, with whom he had four sons: Xerxes, Achaemenes, Masistes and Hystaspes. He also married Artystone, another daughter of Cyrus, with whom he had two sons, Arsames and Gobryas. Darius married Parmys, the daughter of Bardiya, with whom he had a son, Ariomardus. Furthermore, Darius married Phratagune, with whom he had two sons, Abrokomas and Hyperantes. He also married another woman of the nobility, Phaidyme, the daughter of Otanes. It is unknown if he had any children with her. Before these royal marriages, Darius had married an unknown daughter of his good friend and lance carrier Gobryas from an early marriage, with whom he had three sons, Artobazanes, Ariabignes and Arsamenes. Any daughters he had with her are not known. Although Artobazanes was Darius's first-born, Xerxes became heir and the next king through the influence of Atossa; she had great authority in the kingdom as Darius loved her the most of all his wives.
 Link Information: none Question: How long was he married to Artystone?
[EX A]:
Answer: none