Given the question: Write a multi-choice question for the following article, with the given choices and answer: Article: The Chinese mainland and Taiwan today extended the number of regular cross-Straits direct passenger flights from 108 to 270 a week. Six cities, which are Hefei, Harbin, Nanchang, Guiyang, Ningbo and Jinan, are joining another 21 mainland cities in operating direct passenger flights to Taiwan, the Civil Aviation Administration of China (CAAC) said. The 108 direct passenger flights previously operated were all classed as chartered flights. The new services will contain both regular chartered and scheduled flights. Among the 27 designated mainland terminals , 25 will launch scheduled direct passenger flights from Monday to Saturday, to Taipei's Taoyuan or Kaohsiung airports. Scheduled direct _ flights will belaunched between Shanghai, Guangzhou on the mainland and Taoyuan, Kaohsiung, which will bring the total number of weekly chartered and scheduled cargo flights to 28, according to the CAAC. The mainland and Taiwan began direct air and sea transport links and postal services on Dec 15 last year. Previously, air and sea connections, including mail, were routed through a third location, usually Hong Kong. On Nov 4 last year, the mainland and Taiwan agreed to regular direct passenger charter flights across the Straits. Before that, flights were only offered on weekends and during the country's four major traditional festivals - the Spring Festival, Tomb-Sweeping Day, Dragon Boat Festival and the Mid-Autumn Festival. (Xinhua Agency) Options: A Guiyang B Nanchang C Wuhan D Harbin Answer: C Wuhan Question:
The answer is:
Which city is not included in the six cities?