Please answer the following question: Information: - The Warring States period was an era in ancient Chinese history following the Spring and Autumn period and concluding with the Qin wars of conquest that saw the annexation of all other contender states, which ultimately led to the Qin state's victory in 221 BC as the first unified Chinese empire known as the Qin dynasty. Although different scholars point toward different dates ranging from 481 BC to 403 BC as the true beginning of the Warring States, Sima Qian's choice of 475 BC is generally the most often cited and popularly accepted one. The Warring States era also overlaps with the second half of the Eastern Zhou dynasty, though the Chinese sovereign, known as the king of Zhou, ruled merely as a figurehead and served as a backdrop against the machinations of the warring states. - The Spring and Autumn period was a period in Chinese history from approximately 771 to 476 BC (or according to some authorities until 403 BC) which corresponds roughly to the first half of the Eastern Zhou dynasty. The period's name derives from the "Spring and Autumn Annals", a chronicle of the state of Lu between 722 and 479 BC, which tradition associates with Confucius. - Bai Qi ( died 257 BC ) , also known as Bo Qi , was a military general of the Qin state in the Warring States period of Chinese history . Born in Mei ( now Mei County in Shaanxi Province ) , as commander of the Qin army for more than 30 years , Bai Qi was responsible for the deaths of a total over 890,000 ( actually far more than 1,000,000 , in some version even up to 2,000,000 ) enemy soldiers , earning him the nickname Ren Tu ( , human butcher ) . He seized more than 73 cities from the other six Warring States in the Warring States Period and to date no record has been found to show that he suffered a single defeat throughout his military career . He was named by Chinese historians as one of the four greatest generals of the Warring States period , along with Li Mu , Wang Jian and Lian Po . - The Qin dynasty was the first dynasty of Imperial China, lasting from 221 to 206 BC. Named for its heartland of Qin, in modern-day Gansu and Shaanxi, the dynasty was formed after the conquest of six other states by the Qin state, and its founding emperor named Qin Shi Huang, the First Emperor of Qin. The strength of the Qin state was greatly increased by the Legalist reforms of Shang Yang in the fourth century BC, during the Warring States period. In the mid and late third century BC, the Qin accomplished a series of swift conquests, first ending the powerless Zhou dynasty, and eventually conquering the other six of the Seven Warring States to gain control over the whole of China. It is also the shortest dynasty in Chinese history, lasting only 15 years with two emperors. - Lian Po (birth and death dates unknown) was a military general of the Zhao state in the Warring States period of Chinese history. He was named by Chinese historians as one of the four greatest generals of the Warring States period, along with Bai Qi, Wang Jian and Li Mu. - Chinese sovereign is the ruler of a particular period in ancient China. Several titles and naming schemes have been used throughout history. - In politics, a figurehead is a person who holds "de jure" (in name or by law) an important title or office (often supremely powerful), yet "de facto" (in reality) executes little actual power. The metaphor derives from the carved figurehead at the prow of a sailing ship. Commonly cited figureheads include Queen Elizabeth II, who is Queen of sixteen Commonwealth realms and head of the Commonwealth, but has no power over the nations in which she is not head of state and does not exercise power in her own realms on her own initiative. Other figureheads are the Emperor of Japan, the King of Sweden, or presidents in majority of parliamentary republics, such as the President of India, President of Israel, President of Bangladesh, President of Greece, President of Germany, President of Pakistan (starting in 2010), and President of China (without CPC General Secretary and Chairman of CMC posts). - Li Mu (died 229 BC) was a general of the Zhao state during the Warring States period of Chinese history. He was named by Chinese historians as one of the four greatest generals of the Warring States period, along with Bai Qi, Wang Jian and Lian Po. - Sima Qian (; c.145 or 13586 BC), formerly romanized Ssu-ma Chien, was a Chinese historian of the Han dynasty. He is considered the father of Chinese historiography for his "Records of the Grand Historian", a "Jizhuanti"-style (history presented in a series of biographies) general history of China, covering more than two thousand years from the Yellow Emperor to his time, during the reign of Emperor Wu of Han, a work that had much influence for centuries afterwards on history-writing not only in China, but in Korea, Japan and Vietnam as well. Although he worked as the Court Astrologer (Chinese: ; "Taish Ling"), later generations refer to him as the Grand Historian (Chinese: ; Taish Gng or tai-shih-kung) for his monumental work; a work which in later generations would often only be somewhat tacitly or glancingly acknowledged as an achievement only made possible by his acceptance and endurance of punitive actions against him, including imprisonment, castration, and subjection to servility. After reading the paragraphs above, we are interested in knowing the entity with which 'bai qi' exhibits the relationship of 'country of citizenship'. Find the answer from the choices below. Choices: - ancient china - china - greece - han dynasty - israel - japan - lu - pakistan - qi - qin dynasty - sweden - vietnam - zhao
A:
qin dynasty