Question: What is the currency in the country where Bullet Brain takes place?

full_context: Document 1: Bullet Brain: Bullet Brain (Chinese: 神探高倫布; literally "Great Detective Columbo") is a Hong Kong period fantasy television drama produced by TVB, starring Wayne Lai and Natalie Tong, with Lee Tim-sing serving as executive producer and Ip Kwong-yam serving as executive screenwriter. Produced at 25 episodes, the serial premiered on TVB Jade on 8 April 2013. It is set in British Hong Kong during the 1960s.
Document 2: Bahamian dollar: The dollar (sign: $; code: BSD) has been the currency of The Bahamas since 1966. It is normally abbreviated with the dollar sign "$", or alternatively B$ to distinguish it from other dollar-denominated currencies. It is divided into 100 cents.
Document 3: The Criminal Investigator II: The Criminal Investigator II (Traditional Chinese: O記實錄II; lit. "The O Files II") is a 1996 Hong Kong police procedural television drama. Produced by Jonathan Chik with a screenplay edited by Chow Yuk-ming and Chiu Ching-yung, the drama is a TVB production and the direct sequel to 1995's "The Criminal Investigator". The story follows a team of investigators from the Organized Crime and Triad Bureau (OCTB) unit of the Royal Hong Kong Police Force.
Document 4: History of Chinese currency: The currency became legal tender in China commencing in 1937. It was later replaced by issues from puppet banks. However, the currency remained in force in Hong Kong between 1941 and 1945. Initially set at HK$2 = JMY1, the Hong Kong dollar was largely preferred by locals and hoarded away. In order to address this, the Japanese government made possession of Hong Kong dollars illegal in 1943 and required a conversion to JMY at 4 to 1.
Document 5: No Reserve: No Reserve (), also known as "Rosy Business III", is a 2016 Hong Kong espionage television drama serial created and produced by Lee Tim-sing for TVB. It stars Wayne Lai ,
Document 6: Hong Kong dollar: The Hong Kong dollar (Chinese: 港幣; Cantonese Yale: Góng bàih; sign: HK $; code: HKD) is the official currency of Hong Kong. It is subdivided into 100 cents. The Hong Kong Monetary Authority is the governmental currency board and also the de facto central bank for Hong Kong and the Hong Kong dollar.
Document 7: Australian dollar: The Australian dollar (sign: $; code: AUD) is the currency of the Commonwealth of Australia, including its external territories Christmas Island, Cocos (Keeling) Islands, and Norfolk Island, as well as the independent Pacific Island states of Kiribati, Nauru, Papua New Guinea, Tonga, Tuvalu, and Vanuatu. Within Australia, it is almost always abbreviated with the dollar sign ($), with A $or AU $sometimes used to distinguish it from other dollar - denominated currencies. It is subdivided into 100 cents.
Document 8: Sergeant Tabloid: Sergeant Tabloid is a Hong Kong television drama produced by TVB under executive producer Nelson Cheung. The drama tells the story of female police officers of the Hong Kong Police Force, using their perspectives to look at issues of modern women experience in society. "Sergeant Tabloid" first aired on TVB's overseas affiliates and partners from 2 to 27 April 2012.
Document 9: Malaysian ringgit: The Malaysian ringgit (/ ˈrɪŋɡɪt /; plural: ringgit; symbol: RM; currency code: MYR; formerly the Malaysian dollar) is the currency of Malaysia. It is divided into 100 sen (cents). The ringgit is issued by the Bank Negara Malaysia.
Document 10: Columbo: Columbo () is an American television series starring Peter Falk as Columbo, a homicide detective with the Los Angeles Police Department. The character and show, created by Richard Levinson and William Link, popularized the inverted detective story format, which begins by showing the commission of the crime and its perpetrator; the plot therefore usually has no "whodunit" element, and instead revolves around how a perpetrator known to the audience will finally be caught and exposed (sometimes referred to as a "howcatchem").
Document 11: Highs and Lows: Highs and Lows () is a Hong Kong television crime drama serial produced by TVB under executive producer Lam Chi-wah. The drama stars Michael Miu, Raymond Lam, Kate Tsui, Elaine Ng, Ella Koon and Ben Wong. It originally aired from 24 September to 4 November 2012, on Hong Kong's Jade, and ran for 30 episodes.
Document 12: Forensic Heroes III: Forensic Heroes III (also known as FH3) is a 2011 Hong Kong police procedural television drama produced by Television Broadcasts Limited (TVB). The drama is one of three grand TVB productions used to celebrate the channel's 44th anniversary, the other two being "Super Snoops" and "Curse of the Royal Harem". It stars Wayne Lai , Maggie Cheung , Kate Tsui , Ron Ng , Aimee Chan , Edwin Siu , Nancy Wu & Ruco Chan in the third installment and reboot of the "Forensic Heroes" series, featuring new stories and characters. Mui Siu-ching, who also produced the original series, serves as the executive producer.
Document 13: To Catch the Uncatchable: To Catch the Uncatchable (棟篤神探) is a 25-episode TV drama series produced by TVB of Hong Kong, which stars Dayo Wong as the genius (albeit physically weak and with asthma) CID Mok Tsok Tung (莫作棟) and Ada Choi as Vivi Lee Wai Wai (李慧慧), an insurance agent, with Marco Ngai and Michael Tong as major background characters.
Document 14: Bermudian dollar: The Bermudian dollar (symbol: $; code: BMD; also abbreviated BD$; informally called the Bermuda dollar) is the official currency of the British Overseas Territory of Bermuda.  It is subdivided into 100 cents. The Bermudian dollar is not normally traded outside Bermuda, and is pegged to the United States dollar at a one-to-one ratio.  Both currencies circulate in Bermuda on an equal basis.
Document 15: Thai baht: The baht (; Thai: บาท, pronounced [bàːt]; sign: ฿; code: THB) is the official currency of Thailand. It is subdivided into 100 satang (สตางค์, pronounced [sātāːŋ]). The issuance of currency is the responsibility of the Bank of Thailand.
ground_truth: Hong Kong dollar
sub_queries: Which was the country for Bullet Brain? Answer: Hong Kong
what is the currency in Hong Kong china Answer: Hong Kong dollar