Thunderbolt is a wooden roller coaster located at Six Flags New England.
 Opened in 1941, It was designed by Harry Baker and Harry Traver, and built by Joseph Drambour.
 Thunderbolt is the oldest roller coaster at Six Flags New England.
 It is also the oldest roller coaster in any Six Flags park (the Wild One at Six Flags America was built in 1917, but it was relocated from Paragon Park and has only been at Six Flags America since 1986).
 The single PTC train has 4 cars, and an individual lap bar and seatbelt for each person.
 An attendant has to manually unlock each car's lap bars by stepping on and pushing down a release bar at the front of each car.
 Thunderbolt was dedicated an ACE Coaster Landmark on August 2, 2008.
Nitro is a steel roller coaster designed by Bolliger & Mabillard at Six Flags Great Adventure in Jackson, New Jersey, United States.
 It opened on April 7, 2001, as the fastest roller coaster in New Jersey and the tallest on the East Coast of the United States.
 It has been ranked number three in the Golden Ticket Awards Best Steel Roller Coaster every year from 2007 to 2012.
 It was ranked number four in 2013.
Viper is a wooden roller coaster located at Six Flags Great America in Gurnee, Illinois, which opened in 1995.
 Viper features a layout that is a mirror image of the Coney Island Cyclone and is the only roller coaster ever to be built directly by Six Flags.
 Viper is also the only wooden roller coaster that has ever carried this name, (all the other Viper roller coasters, both operating and not, have been steel roller coasters).
 It was built by Rygiel Construction.
Viper is a steel roller coaster made by Arrow Dynamics of the United States.
 The roller coaster is located in the Baja Ridge area of Six Flags Magic Mountain in Valencia, California.
 Viper is the last of the three 7-looper roller coasters built by Arrow Dynamics to remain operating.
 The other two, Shockwave at Six Flags Great America and the Great American Scream Machine at Six Flags Great Adventure, were demolished in 2002 and 2010, respectively.
 The roller coaster replaced a HUSS ride type named Condor.
Viper was a pipeline roller coaster located at Six Flags Great Adventure in Jackson Township, New Jersey.
 Manufactured by TOGO, the ride opened to the public in June 1995.
 The roller coaster closed at the end of the 2004 season and was demolished the following year for various reasons.
 It was replaced with El Toro.
Kingda Ka is a steel accelerator roller coaster located at Six Flags Great Adventure in Jackson, New Jersey, United States.
 It is the world's tallest roller coaster, the world's second fastest roller coaster, and was the second strata coaster ever built.
 It was built by Stakotra, a subcontractor to Intamin.
 Riders have to be 54" in order to be able to get on the roller coaster.
El Toro, a Spanish term meaning The Bull, is a wooden roller coaster at Six Flags Great Adventure in Jackson, New Jersey.
 Designed by Intamin of Switzerland, it opened to the public on June 11, 2006.
 Intamin also worked with members of Rocky Mountain Construction to build the ride.
 When it opened, it had the steepest drop of any wooden roller coaster in the world at 76 degrees, until the record was broken by T Express in 2008 by one degree.
 Overall, its structure height of 181 ft is ranked fourth, its drop height of 176 ft is ranked second, and its top speed of 70 mph is ranked fourth among all wooden roller coasters in the world.
 It was also the first wooden roller coaster to use a cable lift as opposed to the traditional chain lift.
White Cyclone (ホワイトサイクロン , Howaito Saikuron ) is a wooden roller coaster at Nagashima Spa Land in Mie Prefecture, Japan.
 At 1700 m in length, White Cyclone is the third longest wooden roller coaster in the world, and is the longest wooden roller coaster outside of the United States.
 Despite its length, White Cyclone is still considerably shorter than the 2479 m Steel Dragon 2000, the world's longest steel roller coaster, which is also at Nagashima Spa Land.
 In addition to being the third longest wooden roller coaster, White Cyclone is the seventh tallest wooden roller coaster in the world and the fourth tallest wooden roller coaster outside the United States.
 A single ride on the White Cyclone costs ¥1,000 (approximately $9 USD), and the ride is restricted to those individuals above 1.3 m in height; and those individuals under 54 years of age.
Top Thrill Dragster is a steel accelerator roller coaster built by Intamin at Cedar Point in Sandusky, Ohio, United States.
 It was the sixteenth roller coaster built at the park since the Blue Streak in 1964.
 When built in 2003, it was the first full circuit roller coaster to exceed 400 ft in height, and was the tallest roller coaster in the world, before being surpassed by Kingda Ka at Six Flags Great Adventure in May 2005.
 Top Thrill Dragster, along with Kingda Ka, are the only strata coasters in existence.
 It was the second hydraulically launched roller coaster built by Intamin, following "Xcelerator" at Knott's Berry Farm.
 The tagline for Top Thrill Dragster is "Race for the Sky".
Harley Quinn Crazy Train (previously Blackbeard's Lost Treasure Train) is a steel roller coaster located at Six Flags Great Adventure in Jackson Township, New Jersey.
 It was opened in 1999, classified as a junior roller coaster.
 It is a smaller, family-oriented coaster.
 It is considered a junior coaster rather than a kiddie coaster, as adults can ride without a child and the restraints are slightly larger than that of a children's roller coaster.

Question: Which roller coaster, Viper or El Toro,is a wooden roller coaster at Six Flags Great Adventure in Jackson, New Jersey? 
Answer: El Toro