What is the lower end of the FDA temperature danger zone in Celsius?

• A. 5°C
• B. 0°C
• C. 3°C
• D. 7°C

Answer: (A)

The question tests understanding of where foodborne microbes start to multiply rapidly in temperature Conditions. The lower end marks the point at which cold storage stops providing adequate protection and temperatures above that threshold allow growth to accelerate if foods spend time in that range. In FDA guidance, this boundary is given in Celsius and serves as the practical limit for keeping perishable items out of the growth-prone zone. So, keeping foods below that starting point slows or halts most microbial growth, while letting them rise above it means they are in the zone where growth can occur quickly if the product isn’t handled or cooled promptly. The other temperatures listed don’t define that starting boundary: one is too cold to fall into the growth-prone zone, another sits just below the boundary, and another sits above but isn’t the defining lower limit.