Given the question: Information: - Henley-on-Thames is a town and civil parish on the River Thames in Oxfordshire, England, northeast of Reading and 7miles west of Maidenhead. One of its boundaries has the tripoint of Oxfordshire, Berkshire and Buckinghamshire. The 2011 Census recorded the parish population as 11,619. History. <includeonly>Henley does not appear in Domesday Book of 1086; often it is mistaken for "Henlei" in the book which is in Surrey.</includeonly> The first record of Henley is from 1179, when it is recorded that King Henry II "had bought land for the making of buildings". King John granted the manor of Benson and the town and manor of Henley to Robert Harcourt in 1199. A church at Henley is first mentioned in 1204. In 1205 the town received a paviage grant, and in 1234 the bridge is first mentioned. In 1278 Henley is described as a hamlet of Benson with a chapel. The street plan was probably established by the end of the 13th century. - Henley Women's Regatta, often appreviated to "HWR" or "Women's Henley", is a rowing regatta held at Henley-on-Thames, England. It was first held in 1988, as a response to the absence of women's events at Henley Royal Regatta at that time. While Henley Royal Regatta now offers three women's events, Women's Henley has continued to build and expand. Henley Women's Regatta now lasts three full days, and includes time trials for over-subscribed events. - The River Thames is a river that flows through southern England. At , it is the longest river entirely in England and the second longest in the United Kingdom, after the River Severn. It also flows through Oxford (where it is called Isis), Reading, Henley-on-Thames and Windsor. The lower reaches of the river are called the Tideway, derived from its long tidal reach up to Teddington Lock. It rises at Thames Head in Gloucestershire, and flows into the North Sea via the Thames Estuary. The Thames drains the whole of Greater London. - The Prince Albert Challenge Cup is an event at Henley Royal Regatta . It is contested by Men 's Student Crews in Coxed fours . It has been held since 2004 . - Henley Royal Regatta (or Henley Regatta, its original name pre-dating Royal patronage) is a rowing event held annually on the River Thames by the town of Henley-on-Thames, England. It was established on 26 March 1839. It differs from the three other regattas rowed over approximately the same course, Henley Women's Regatta, Henley Masters Regatta and Henley Town and Visitors' Regatta, each of which is an entirely separate event. - England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west. The Irish Sea lies northwest of England and the Celtic Sea lies to the southwest. England is separated from continental Europe by the North Sea to the east and the English Channel to the south. The country covers five-eighths of the island of Great Britain (which lies in the North Atlantic) in its centre and south; and includes over 100 smaller islands such as the Isles of Scilly, and the Isle of Wight. After reading the paragraphs above, we are interested in knowing the entity with which 'prince albert challenge cup' exhibits the relationship of 'subclass of'. Find the answer from the choices below. Choices: - bridge - census - chapel - course - england - english - event - irish - island - name - parish - plan - record - regatta - river - rowing - rowing event - sea - town
The answer is:
rowing event