Which solution is sporicidal in 10 hours?

The answer is correct because alkaline glutaraldehyde is known for its effectiveness as a disinfectant and sterilizing agent, particularly in a healthcare setting. It is a solution that can achieve sporicidal activity within a relatively short exposure time compared to other agents. When alkaline glutaraldehyde is maintained at proper temperatures and pH levels, it can effectively kill spores, including those of Clostridium difficile and other resistant pathogens, within about 10 hours.

It is essential to note that while acid glutaraldehyde also serves as a disinfectant, it typically requires a longer exposure time to achieve the same level of efficacy, especially regarding spore killing. Cidex, which is a brand name for a specific formulation of glutaraldehyde, may not be precisely identified with sporicidal properties when compared to the alkaline variant in the specified time frame. Bleach is also an effective sporicidal agent but usually requires an appropriate concentration and contact time that may differ from the 10-hour specification associated with alkaline glutaraldehyde.

Understanding these nuances helps emphasize why alkaline glutaraldehyde stands out as the correct choice for achieving sporicidal activity within the designated timeframe.