The grapefruit ("Citrus" × "paradisi") is a subtropical citrus tree known for its sour to semi-sweet, somewhat bitter fruit.
 Grapefruit is a hybrid originating in Barbados as an accidental cross between two introduced species, sweet orange ("C. sinensis") and pomelo or shaddock ("C. maxima"), both of which were introduced from Asia in the seventeenth century.
 When found, it was named the “forbidden fruit”; and frequently, it has been misidentified with the pomelo.
The ugli or ugli fruit is a Jamaican form of tangelo, a citrus fruit created by hybridizing a grapefruit (or pomelo), an orange, and a tangerine.
The Devanahalli pomelo (also called Devanahalli Pomello in official documents) is a variety of the citrus fruit pomelo ("Citrus maxima") of the family Rutaceae.
 It is exclusively grown in the region around Devanahalli taluk, Bangalore Rural District, India, as an exotic crop variety.
 Its officially designated name is "Devanahalli Pomello (Chakkota)"; it is locally known as chakkota.
The pomelo, "Citrus maxima", or "Citrus grandis", also called pomello, pummelo, pommelo, pamplemousse, jabong (Hawaii), or shaddock, is a natural (non-hybrid) citrus fruit, similar in appearance to a large grapefruit, native to South and Southeast Asia.
Citrus junos or yuzu (from Japanese ユズ ) is a citrus fruit and plant in the family Rutaceae.
 It is called yuja (from Korean 유자 ) in Korean cuisine context.
 Both Japanese "yuzu" and Korean "yuja" are cognates of Chinese "yòuzi" (柚子 ), but the Chinese word means pomelo.
 Yuzu is called "xiāngchéng" (香橙 ) in Chinese.
The tangelo ( or ; "C. reticulata × C. maxima" or "x C. paradisi"), "Citrus × tangelo", is a citrus fruit hybrid of tangerine and pomelo or grapefruit.
The Melogold or Melogold grapefruit ("Citrus grandis" Osbeck × "C. Paradisi" Macf.)
 is a citrus hybrid similar to the oroblanco; both result from a cross between the pomelo and the grapefruit and is a fruit similar to a sweet grapefruit.
The citron is a large fragrant citrus fruit with a thick rind, botanically classified as Citrus medica by both the Swingle and Tanaka botanical name systems.
 It is one of the four original citrus fruits (the others being pomelo, mandarin and papeda), from which all other citrus types developed through natural hybrid speciation or artificial hybridization.
Dangyuja (당유자 , ] ) is a Korean non-hybrid citrus fruit that is a specialty of Jeju Island.
 In Jeju language, it is called Daengyuji(댕유지 ; ] ).
 Dangyuja has a similar shape and flavour to yuja, but is genealogically a variety of pomelo.
An oroblanco, oro blanco (white gold) or sweetie ("Citrus grandis" Osbeck × "C. Paradisi" Macf.)
 is a sweet seedless citrus hybrid fruit similar to grapefruit.
 It is often referred to as oroblanco grapefruit.

Question: What fruit are the oroblanco and the pomelo similar to?
Answer: similar to grapefruit