According to the eighth paragraph of Article 8 of the Trademark Law:

Trademarks may not use the following words and figures: directly indicating the quality, main raw materials, functions, uses, weight, quantity and other characteristics of the goods; Silk is registered on 25 kinds of stockings, which directly represents the main raw materials, so it cannot be registered as a trademark.

In fact, we can see that C's answer is controversial, because the trademark is an old trademark before the introduction of the new trademark law, and this situation is unlikely to pass the review in the future. In addition, it is reported that Anjiayao, a member of the Chinese People's Political Consultative Conference, suggested that the packaging of tobacco products should be changed as soon as possible according to the provisions of the Convention, and brand trademarks representing the image of the country and the nation such as "China" and "Zhongnanhai" should be stopped.

Please feel free to call me if you have any other questions.