Which of the following is NOT a basic type of hazard to the hands?

The correct choice identifies mechanical hazards, extreme heat, and irritating substances as not belonging to the same category when considering basic types of hazards specifically affecting the hands.

Mechanical hazards encompass risks such as cuts or crush injuries from machinery. Environmental hazards indicate factors like extreme temperatures or exposure to harsh conditions that can cause injury over time. Irritating substances are typically chemicals that can cause skin reactions or burns upon contact.

While abrasions and liquids can cause direct physical harm or exposure-related injuries, extreme heat usually falls into a different classification associated with overall thermal hazards rather than being specifically categorized under basic hand hazards. In this context, extreme heat serves as an important consideration but not as a fundamental category of hazards to the hands like the other options correctly group.

Understanding the classifications of hazards is crucial for developing effective safety protocols and training, ensuring that workers can identify and mitigate risks associated with hand injuries in various settings.