The trade names of drugs shall not be written in generic names, their fonts and colors shall not be more prominent and conspicuous than generic names, and their fonts shall not exceed half of the fonts used in generic names in terms of single word area. A is correct; The external drug label is marked with white "external use" in the background color of the red box, and B is wrong; The font color of drug generic names should be black or white, and no other colors should be used. C error; The font of a registered trademark containing characters shall not be larger than a quarter of the font used for generic names, calculated by the area of a single word. D error.