Which of the following statements is true regarding immunodeficiency disorders?

Explanation: The correct answer is b. Common variable immunodeficiency (CVID). CVID is an example of a primary immunodeficiency disorder, which is typically caused by genetic mutations affecting the immune system's development and function.

Incorrect choices:

a. Human immunodeficiency virus (HIV) infection is an example of a secondary immunodeficiency disorder, which occurs due to an external factor, such as a viral infection, damaging the immune system.

c. Rheumatoid arthritis is an autoimmune disorder that affects the joints and is not classified as an immunodeficiency disorder.

d. Diabetes mellitus is a metabolic disorder involving insulin production and does not directly affect the immune system's function.

Explanation: The correct answer is c. Immunodeficiency disorders can lead to an increased susceptibility to infections. Immunodeficiency disorders are characterized by a weakened or impaired immune system, making individuals more susceptible to infections, both common and opportunistic.

Incorrect choices:

a. Immunodeficiency disorders result from a weakened immune system, not an overactive one. In overactive immune responses, autoimmune disorders may occur.

b. While some immunodeficiency disorders have a genetic basis, not all cases are caused by genetic factors. Some immunodeficiency disorders can be acquired later in life due to infections, medications, or other factors.

d. Immunodeficiency disorders are not typically treated with anti-inflammatory medications. Treatment may involve immunoglobulin replacement therapy, antiviral medications, or stem cell transplantation, depending on the specific disorder and its underlying cause.