In this task, you are given a context, a subject, a relation, and many options. Based on the context, from the options select the object entity that has the given relation with the subject. Answer with text (not indexes).

Context: Korea is a historical state in East Asia, since 1945 divided into two distinct sovereign states: North Korea (officially the "Democratic People's Republic of Korea") and South Korea (officially the "Republic of Korea"). Located on the Korean Peninsula, Korea is bordered by China to the northwest and Russia to the northeast. It is separated from Japan to the east by the Korea Strait and the East Sea., Japan ("Nippon" or "Nihon" ; formally "" or "Nihon-koku", means "State of Japan") is a sovereign island nation in Eastern Asia. Located in the Pacific Ocean, It is lying off the eastern coast of the Asia Mainland (east of China, Korea, Russia) and stretching from the Sea of Okhotsk in the north to the East China Sea and near Taiwan in the southwest. , A courtesy name ("zi"), also known as a style name, is a name bestowed upon one at adulthood in addition to one's given name. This practice is a tradition in East Asian cultures, including China, Japan, Korea, and Vietnam., Vietnam, officially the Socialist Republic of Vietnam (SRV), is the easternmost country on the Indochina Peninsula in Southeast Asia. With an estimated 90.5 million inhabitants , it is the world's 14th-most-populous country, and the eighth-most-populous Asian country. Vietnam is bordered by China to the north, Laos to the northwest, Cambodia to the southwest, Thailand across the Gulf of Thailand to the southwest, and the Philippines, Malaysia and Indonesia across the South China Sea to the east and southeast. Its capital city has been Hanoi since the reunification of North and South Vietnam in 1976., China, officially the People's Republic of China (PRC), is a unitary sovereign state in East Asia. With a population of over 1.381billion, it is the world's most populous country. The state is governed by the Communist Party of China, and its capital is Beijing. It exercises jurisdiction over 22 provinces, five autonomous regions, four direct-controlled municipalities (Beijing, Tianjin, Shanghai, and Chongqing), and two mostly self-governing special administrative regions (Hong Kong and Macau), and claims sovereignty over Taiwan. The country's major urban areas include Shanghai, Guangzhou, Beijing, Chongqing, Shenzhen, Tianjin and Hong Kong. China is a great power and a major regional power within Asia, and has been characterized as a potential superpower., The War of the Eight Princes, Rebellion of the Eight Kings or Rebellion of the Eight Princes was a series of civil wars among kings/princes (Chinese: "wang" ) of the Chinese Jin dynasty from AD 291 to 306. The key point of contention in these conflicts was the regency over the developmentally disabled Emperor Hui of Jin. The term stems from biographies of eight princes collected in chapter 59 of the "Book of Jin" ("Jinshu")., The Book of Jin is an official Chinese historical text covering the history of the Jin dynasty from 265 to 420. It was compiled in 648 by a number of officials commissioned by the imperial court of the Tang dynasty, with chancellor Fang Xuanling as the lead editor, drawing mostly from official documents left from earlier archives. A few essays in volumes 1, 3, 54 and 80 were composed by the Tang dynasty's Emperor Taizong himself. The contents of the "Book of Jin", however, included not only the history of the Jin dynasty, but also that of the Sixteen Kingdoms period, which was contemporaneous with the Eastern Jin dynasty., Sima Liang ( ) ( died 291 ) , courtesy name Ziyi ( ) , formally Prince Wencheng of Ru'nan ( ) , was briefly a regent during the reign of Emperor Hui during Jin Dynasty ( 265 - 420 ) . He was the first of the eight princes commonly associated with the War of the Eight Princes ., Emperor Hui of Jin (259 - January 8, 307), personal name Sima Zhong (), courtesy name Zhengdu (), was the second emperor of the Jin Dynasty (265-420). Emperor Hui was a developmentally disabled ruler, and throughout his reign, there was constant internecine fighting between regents, imperial princes (his uncles and cousins), and his wife Empress Jia Nanfeng for the right to control him (and therefore the imperial administration), causing great suffering for the people and greatly undermining the stability of the Jin regime, eventually leading to Wu Hu rebellions that led to Jin's loss of northern and central China and the establishment of the competing Sixteen Kingdoms. He was briefly deposed by his granduncle Sima Lun, who usurped the throne himself, in 301, but later that year was restored to the throne and continued to be the emperor until 307, when he was poisoned, likely by the regent Sima Yue., Subject: sima liang, Relation: country_of_citizenship, Options: (A) cambodia (B) china (C) editor (D) indonesia (E) japan (F) jin dynasty (G) korea (H) laos (I) philippines (J) republic of china (K) south vietnam (L) tang dynasty (M) vietnam
china