R-410A is an A1 refrigerant. It is non-toxic and has low flammability, making it one of the safest refrigerants to use.

• A. False
• B. Not specified
• C. True
• D. Depends on conditions

Answer: (C)

The concept tested is refrigerant safety classifications, specifically what the A1 designation means. An A1 refrigerant is categorized as non-toxic and non-flammable under normal use. R-410A carries this A1 rating, so describing it as non-toxic and having low flammability matches what the safety designation specifies. This is why the statement is true: its toxicity and flammability risks are considered very low within the standard classifications.

Keep in mind that “safest” here refers to toxicity and flammability, not all possible hazards. R-410A operates at high pressures and has a high global warming potential, so other safety and environmental factors still require careful handling and proper system design.