What is meant by acquired deficiency in the immune system?

Acquired deficiency in the immune system refers to a situation where the body's ability to fight off infections and diseases is compromised due to external factors that occur after birth. This can include a variety of causes such as infections (like HIV), malnutrition, certain medical treatments (such as chemotherapy), or other factors that can weaken the immune response.

Understanding that these deficiencies develop after a person has been born helps to differentiate them from congenital deficiencies, which are present from birth due to genetic or developmental issues. This distinction is crucial in both diagnosis and treatment, as acquired deficiencies can often be addressed through various interventions, while congenital issues may require more complex management strategies. In contrast to other options that suggest the deficiency is inherent from birth or a purely genetic issue, option B accurately captures the essence of acquired immune deficiency.