SafeMark Practice Test

The main idea here is the time–temperature relationship in food safety. You can achieve the same level of microbial reduction by holding at a lower temperature for a longer time or by cooking to a higher temperature for a shorter time. For roast pork and ham, there are validated holding combinations that ensure safety: 130°F for 112 minutes, 140°F for 12 minutes, or 145°F for 4 minutes. These specific pairings come from guidelines that match the needed lethal effect to the temperature-time combination, so the pork and ham reach a safe level even if the temperature is not extremely high.

The other options don’t fit those standard holding-time charts: 165°F for less than one second isn’t a recognized hold-time for roasts, and 145°F for 15 seconds or 155°F for 17 seconds are not established safe combinations for this purpose.