The anesthetic ___ is carcinogenic and must be used with PPE.

Urethane is recognized as a carcinogenic substance, which is why it requires the use of personal protective equipment (PPE) when handling. Urethane has been shown to induce tumors in laboratory animals and poses a significant risk if exposure occurs. The carcinogenic properties necessitate precautions to protect laboratory personnel from inhalation or dermal exposure. This is a critical point in laboratory animal care and handling, ensuring the safety of staff working in facilities where such compounds are used. While the other anesthetics listed may have their own safety considerations, urethane's specific classification as a carcinogen distinctly sets it apart, highlighting the importance of stringent safety protocols when working with it.