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'.

Example Input: Passage: The spotted green pigeon or Liverpool pigeon (Caloenas maculata) is a species of pigeon which is most likely extinct. It was first mentioned and described in 1783 by John Latham, who had seen two specimens of unknown provenance and a drawing depicting the bird. The taxonomic relationships of the bird were long obscure, and early writers suggested many different possibilities, though the idea that it was related to the Nicobar pigeon (C. nicobarica) prevailed, and it was therefore placed in the same genus, Caloenas. Today, the species is only known from a specimen kept in World Museum, Liverpool. Overlooked for much of the 20th century, it was recognised as a valid extinct species by the IUCN Red List only in 2008. In 2014 a genetic study confirmed it as a distinct species related to the Nicobar pigeon, and showed that the two were the closest relatives of the extinct dodo and Rodrigues solitaire.
 Link Information: The animal order Columbiformes is also constituted of pigeons and doves, and includes about 42 genera and 310 species.
 Question: How many species of pigeons are there?
Example Output: Answer: 310

Example Input: Passage: Michael Caine is an English actor who has appeared in over 130 films and has had multiple television appearances. Caine's acting career began in the 1950s, when he was cast in many small, often uncredited roles in British films. Caine gained recognition as one of the most famous actors of the 1960s through his breakthrough role in the film Zulu (1964). He then portrayed spy Harry Palmer in the films The Ipcress File (1965), Funeral in Berlin (1966) and Billion Dollar Brain (1967). He also had starring roles in The Italian Job and Battle of Britain (both 1969). His role in Sleuth (1972) led him to an Academy Award for Best Actor nomination. Caine has won a Best Supporting Actor Oscar for the films Hannah and Her Sisters (1986) and The Cider House Rules (1999). More recently, Caine has gained a new following through his collaborations with British-American filmmaker Christopher Nolan in the Dark Knight Trilogy films, as well as Inception (2010) and Interstellar (2014).
 Link Information: Caine has gained a new following through his collaborations with British-American filmmaker Christopher Nolan in the Dark Knight Trilogy films, Question: Which of the two who collaborated together in the Dark Knight Trilogy films is older?
Example Output: Answer: Michael Caine

Example Input: Passage: The group was formed in Cicero, Illinois, United States, as Gary & The Knight Lites. The founding members included Gary Loizzo (vocals and guitar), Charles Colbert, Jr. (bass guitar and vocals), Al Ciner (guitar and vocals), and Jim Michalak (drums). Early releases included- "I'm Glad She's Mine," "I Don't Need Your Help," "Will You Go Steady," "Take Me Back," among others. The group's greatest success as "The American Breed" was the single, "Bend Me, Shape Me", which reached number five on the U.S. Billboard Hot 100 chart in 1968. The song, written by Scott English and Larry Weiss, had previously been recorded by an all-female band known as the Shape and had been a hit on the UK Singles Chart for the British group Amen Corner. It had also been recorded by The Outsiders after they had reached the top ten with "Time Won't Let Me" in 1966. Contributing to the success of the American Breed's version of "Bend Me, Shape Me" was the excellent arrangement of the song by the band's record producer, Bill Traut, who added horns among other changes. The group also appeared on the 16 December 1967 episode of the television show American Bandstand, along with Pink Floyd.
 Link Information: none Question: Which song holds the record of longest weeks at number 1 on the chart where The American Breed's greatest single reached number 5 in 1968?
Example Output:
Answer: none