Question: Barry Ricardo Forde (born September 17, 1976) is a Barbadian track cyclist, he was banned for two years and two months after testing positive for Testosterone on October 28, 2005, Testosterone is a medication and naturally occurring what?

full_context: Document 1: Stanozolol: Stanozolol, sold under many brand names, is a synthetic anabolic-androgenic steroid (AAS) which was derived from dihydrotestosterone (DHT). It was developed by American pharmaceutical company Winthrop Laboratories (Sterling Drug) in 1962, and has been approved by the FDA for human use, though it is no longer marketed in this country.
Document 2: Lance Armstrong: Lance Edward Armstrong (born Lance Edward Gunderson on September 18, 1971) is an American former professional road racing cyclist. Armstrong is the 1993 professional world champion, and won the Tour de France a record seven consecutive times from 1999 to 2005. However, in 2012, he was banned from sanctioned Olympic sports for life as a result of long-term doping offenses. As part of those sanctions, all results going back to August 1998, including his seven Tour wins, were voided.
Document 3: Growth hormone treatment: Growth hormone treatment refers to the use of growth hormone (GH) as a prescription medication—it is one form of hormone therapy. Growth hormone is a peptide hormone secreted by the pituitary gland that stimulates growth and cell reproduction. In the past, growth hormone was extracted from human pituitary glands. Growth hormone is now produced by recombinant DNA technology and is prescribed for a variety of reasons. GH therapy has been a focus of social and ethical controversies for 50 years.
Document 4: Éric Barone: Éric Barone (born 4 November 1960 in Oyonnax, France) is a French sportsman. He holds the world speed record for bicycle, on both snow and gravel. On snow, his speed record is 227.720 km/h achieved on the 18th March 2017, on the speed snow track at Vars, France while on gravel his speed record is 172 km/h , achieved at the Cerro Negro volcano, in Nicaragua. His French nickname is “Baron Rouge”, which means Red Baron.
Document 5: Tino Best: Tino la Bertram Best (born 26 August 1981) is a West Indian cricketer. Standing 5 ft , Tino Best is a fast and aggressive right-arm bowler. Since 2002, he has played domestic cricket for his native Barbados, with a season at English club Yorkshire in 2010. Best made his Test debut in May 2003 and played his first One Day International a year later. A back strain incurred in May 2004 prevented Best from playing cricket until March the following year. In 2008 Best signed to play in the Indian Cricket League because he had not played international cricket since 2006. He returned to the side when the West Indies fielded a side weakened by contract disputes between leading players and the West Indies Cricket Board but was dropped shortly after. On his return to the Test side on 10 June 2012, he broke the record for highest score by a number 11 batsman, making 95 against England at Edgbaston.But,later in 2013 his record was surpssed by Ashton Agar who scored 98. The 143-run partnership with Denesh Ramdin in the same match was also notable; it is the third-highest Test stand with one wicket remaining.
Document 6: Prasterone: Prasterone, also known as dehydroepiandrosterone (DHEA), is a naturally occurring steroid which is used as a supplement and medication. It is an androstane derivative and a precursor of steroid hormones like testosterone and estradiol. Prasterone has weak androgenic activity, weak estrogenic activity, and neurosteroid activity, and acts as a prohormone of androgens and estrogens depending on its dosage and route of administration. As a medication, prasterone may be used to restore or increase DHEA levels in deficiency or old age, for menopausal women as a weak androgen or to treat vaginal atrophy, and, in its sulfate form, for cervical dilation during childbirth.
Document 7: Zeuterin: Zeuterin ("zū-tur-in") is the trade name of an injectable product containing zinc gluconate and the amino acid arginine, which is used for sterilizing young male dogs without the removal of the testicles. The product is injected directly into the testicle, where the zinc gluconate destroys the sperm and causes inflammation, which leads to fibrosis and causes sterility. Sperm production continues for up to 60 days after product administration, and in some dogs does not stop completely, although the product is 99.6% effective when given to dogs aged three to ten months of age. Following administration, the testicles atrophy; the degree of atrophy may vary noticeably between testicles. The male hormone, testosterone, is produced in limited quantities following treatment with Zeuterin, but after two years, testosterone production is similar to that in untreated dogs. The continuing presence of testosterone means that, unlike surgical castration, chemical castration does not remove the risk of testosterone-associated disease, such as prostatic disease.
Document 8: Testosterone (medication): Testosterone is a medication and naturally occurring steroid hormone. It is used to treat male hypogonadism and certain types of breast cancer. It may also be used to increase athletic ability in the form of doping. It is unclear if the use of testosterone for low levels due to aging is beneficial or harmful. Testosterone can be used as a gel or patch that is applied to the skin, injection into a muscle, tablet that is placed in the cheek, or tablet that is taken by mouth.
Document 9: Tom Barras: Tom Barras (born 21 June 1978 in Keighley, West Yorkshire) is an English former professional road racing cyclist. He has taken more than 100 race wins during his career. Barras is also the son of former professional racing cyclist, Sid Barras. After graduating from Loughborough University in 2000, Tom started his professional career in Belgium, before returning to the UK in 2006. He combined his racing with work as a web designer from 2007. Barras was ranked 13th in the UK national road rankings at the end of the 2007 racing season. In December 2014 he was announced as a member of the NFTO squad for 2015. Barras retired from racing at the end of the 2015 season, but remained with NFTO as a directeur sportif.
Document 10: Barry Forde: Barry Ricardo Forde (born September 17, 1976) is a Barbadian track cyclist. Forde was banned for two years and two months after testing positive for Testosterone on October 28, 2005.
Document 11: Boldenone undecylenate: Boldenone undecylenate (USAN) (brand names Boldane, Equipoise, Parenabol, Vebonol, others), or boldenone undecenoate (BANM), also known as Δ-testosterone 17β-undec-10-enoate, 1-dehydrotestosterone 17β-undec-10-enoate, or androsta-1,4-dien-17β-ol-3-one 17β-undec-10-enoate, is a synthetic, injected anabolic-androgenic steroid (AAS) and androgen ester that is used in veterinary medicine, specifically in horses. It is a long-acting ester of boldenone, which itself is a naturally occurring androgen (found in the scent gland of "Ilybius fenestratus") and dehydrogenated analogue of testosterone.
Document 12: Barry Horne: Barry Horne (17 March 1952 – 5 November 2001) was an English animal rights activist. He became known around the world in December 1998, when he engaged in a 68-day hunger strike in an effort to persuade the British government to hold a public inquiry into animal testing, something the Labour Party had said it would do before it came to power in 1997. The hunger strike took place while Horne was serving an 18-year sentence for planting incendiary devices in stores that sold fur coats and leather products, the longest sentence handed down to any animal rights activist by a British court.
Document 13: Oxandrolone: Oxandrolone (brand names Oxandrin, Anavar, Lonavar, others), is a synthetic, orally active anabolic-androgenic steroid (AAS) that first became available as a prescription drug in the United States in 1964. It is a 17α-methylated derivative of dihydrotestosterone (DHT) that has an oxygen atom in place of the carbon at the 2 position.
Document 14: Estrogen: Estrogen (American English) or oestrogen (British English) is the primary female sex hormone as well as a medication. It is responsible for the development and regulation of the female reproductive system and secondary sex characteristics. "Estrogen" may also refer to any substance, natural or synthetic, that mimics the effects of the natural hormone. The estrane steroid estradiol is the most potent and prevalent endogenous estrogen, although several metabolites of estradiol also have estrogenic hormonal activity. Estrogens are used as medications as part of some oral contraceptives, in hormone replacement therapy for postmenopausal, hypogonadal, and transgender women, and in the treatment of certain hormone-sensitive cancers like prostate cancer and breast cancer. They are one of three types of sex hormones, the others being androgens/anabolic steroids like testosterone and progestogens like progesterone.
Document 15: Tim Montgomery: Timothy "Tim" Montgomery (born January 28, 1975) is an American former track and field sprinter who specialized in the 100-meter dash. In 2005, he was stripped of his records—including a now void men's 100 m world record of 9.78 seconds set in 2002—after being found guilty of using performance-enhancing drugs as a central figure in the BALCO scandal. Since retiring from athletics, he has been tried and convicted for his part in a New York-based check fraud scheme and for dealing heroin in the Hampton Roads area of Virginia.
ground_truth: steroid hormone