Final answer:
The person on chemotherapy will be placed on reverse isolation when the ANC is below 500. This is because a low ANC indicates a compromised immune system, making the person more susceptible to infections.
Step-by-step explanation:
The person on chemotherapy will be placed on reverse isolation when the Absolute Neutrophil Count (ANC) is below 500. The ANC is a measure of the number of neutrophils in the blood, which are an important type of white blood cell that help fight off infections. When the ANC is low, it means that the person's immune system is compromised and they are at a higher risk of developing infections.
For example, if a person's ANC is 400, they would be placed on reverse isolation to minimize their exposure to potential sources of infection, such as other people or contaminated surfaces. This may involve staying in a separate room, wearing a mask, and having strict hygiene measures in place.
Therefore, the correct answer is A) 500, as when the ANC falls below this level, the person on chemotherapy is placed on reverse isolation.