Context: Gatwick Airport (also known as London Gatwick) is a major international airport in south-east England, south of Central London and north of Crawley. It is the second-busiest airport by total passenger traffic in the United Kingdom, after London Heathrow. Gatwick is the ninth-busiest airport in Europe., Brighton is a seaside resort in East Sussex, England., Chichester is a cathedral city in West Sussex, in South-East England. It is the only city in West Sussex and is its county town. It has a long history as a settlement from Roman times and was important in Anglo-Saxon times. It is the seat of a bishopric, with a 12th-century cathedral, and is home to some of the oldest churches and buildings in Great Britain., Mid Sussex is a local government district in the English county of West Sussex. It contains the towns of East Grinstead, Haywards Heath and Burgess Hill., West Sussex is a county in the south of England, bordering East Sussex (with Brighton and Hove) to the east, Hampshire to the west and Surrey to the north, and to the south the English Channel. Chichester in the southwest is the county town and only city in West Sussex, with the largest towns being Crawley, Worthing and Horsham. 
West Sussex has a range of scenery, including wealden, downland and coastal. The highest point of the county is Blackdown, at 280 metres (919 ft). It has a number of stately homes including Goodwood, Petworth House and Uppark and also castles such as Arundel Castle and Bramber Castle. Over half the county is protected countryside, offering walking, cycling and other recreational opportunities., East Grinstead is a town and civil parish in the northeastern corner of Mid Sussex district of West Sussex in England near the East Sussex, Surrey, and Kent borders. It lies south of London, north northeast of Brighton, and east northeast of the county town of Chichester. The civil parish covers an area of and had a population of 23,942 persons in the 2001 census. The population of the town at the 2011 Census was 26,383. Nearby towns include Crawley and Horley to the west, Tunbridge Wells to the east and Redhill and Reigate to the northwest. The town is contiguous with the village of Felbridge to the northwest. Until 1974 East Grinstead was the centre for local government - East Grinstead Urban District Council - and was located in the county of East Sussex. East Grinstead, along with Haywards Heath and Burgess Hill, as part of the former Cuckfield Rural District Council, came together as Mid-Sussex; moving to the jurisdiction of West Sussex County Council. The town has many historic buildings and is located on the Greenwich Meridian. It is located in the Weald and Ashdown Forest lies to the south of the town., In England, a civil parish is a territorial designation which is the lowest tier of local government below districts and counties, or their combined form, the unitary authority. It is an administrative parish, in contrast to an ecclesiastical parish., Balcombe is a village and civil parish in the Mid Sussex district of West Sussex, England. It lies south of London, north of Brighton, and east north east of the county town of Chichester. Nearby towns include Crawley to the north west and Haywards Heath to the south south east., Crawley is a town and borough in West Sussex, England. It is south of Charing Cross (London), north of Brighton and Hove, and north-east of the county town of Chichester. Crawley covers an area of and had a population of 106,597 at the time of the 2011 Census., Horsham is a market town on the upper reaches of the River Arun in the centre of the Weald in Sussex, England. The town is south south-west of London, north-west of Brighton and north-east of the county town of Chichester. Nearby towns include Crawley to the north-east and Haywards Heath and Burgess Hill to the south-east. It is the administrative centre of the Horsham district., Burgess Hill is a civil parish and a town located in the Mid Sussex district of West Sussex, England, close to the border with East Sussex, on the edge of the South Downs National Park. Located south of London, north of Brighton and Hove, and east-northeast of the county town of Chichester, it occupies an area of and had a population of 30,635 at the time of the 2011 Census, making it the fourth most populous parish in the county (behind Crawley, Worthing and Horsham) and the most populous in the district. Other nearby towns include Haywards Heath to the North East and Lewes, the County town of East Sussex, to the South East., Sussex (abbreviated Sx), from the Old English "Sþsaxe" (South Saxons), is a historic county in South East England corresponding roughly in area to the ancient Kingdom of Sussex. It is bounded to the west by Hampshire, north by Surrey, north-east by Kent, south by the English Channel, and divided for local government into West Sussex and East Sussex and the city of Brighton and Hove. Brighton and Hove was created as a unitary authority in 1997, and granted City status in 2000. Until then, Chichester was Sussex's only city., Built in 1841 , the Ouse Valley Viaduct ( also called Balcombe Viaduct ) over the River Ouse on the London - Brighton Railway Line north of Haywards Heath and south of Balcombe is 1,475 feet ( 450 m ) long ., Haywards Heath is a town in the Mid Sussex District of West Sussex, within the historic county of Sussex, England. It lies south of London, north of Brighton, south of Gatwick Airport and east northeast of the county town of Chichester. Nearby towns include Burgess Hill to the southwest, Horsham to the northwest, Crawley north-northwest and East Grinstead north-northeast. Being a commuter town with only a relatively small number of jobs available in the immediate vicinity, mostly in the agricultural or service sector, many of the residents commute daily via road or rail to London, Brighton, Crawley or Gatwick for work., Subject: ouse valley viaduct, Relation: located_in_the_administrative_territorial_entity, Options: (A) arun (B) brighton (C) central (D) chichester (E) crawley (F) east (G) east grinstead (H) east sussex (I) england (J) hampshire (K) hill (L) horsham (M) hove (N) london (O) mid sussex (P) national park (Q) north (R) north east (S) northwest (T) of (U) river (V) seaside (W) south (X) surrey (Y) sussex (Z) time ([) united kingdom (\) west
Output: mid sussex