单选题 Reingold and other epidemiologists don't discount hand--washing as an important tool in public health: there is plenty of evidence that it prevents other nasty bugs, including the common cold, many respiratory (呼吸道的) infections, and viruses that cause diarrhea (腹泻). But Reingold is bothered by the lack of science supporting the CDC's message, and he worries that the emphasis on a simple measure like hand -washing creates a false sense of security from H1N1 and tamps down the discussion of more difficult preventive measures. He said as much in an e - mail to the CDC this May. "I wouldn't care so much that we might be getting folks to improve hand - washing... with what is likely to be incorrect information about its ability to prevent influenza" if the media and the court of public opinion weren't so quick to embrace it as the only solution at the expense of things like surgical masks, wrote Reingold in his letter to the CDC. While Reingold admits he doesn't know if masks would reduce transmission of the virus, he hypothesizes that they're more likely to be helpful containing exposure to the airborne virus than hand -washing, and should not be so easily discounted. (Other experts are skeptical of face masks because it's difficult to ensure proper use, or that people will wear them in the first place. )
Hand -washing can prevent some nasty bugs, but not including

• A. the comnlon cold.
• B. respiratory infections.
• C. viruses causing diarrhea.
• D. HI N1 viruses.