DiGeorge’s syndrome is characterized by a deficiency of _____.: (A) B lymphocytes, (B) T lymphocytes, (C) Both B and T lymphocytes, (D) Antibodies
Answer is B. DiGeorge’s syndrome is characterized by a deficiency of T cells. It is caused by the failure of the third and fourth brachial pouches to develop normally, resulting in a lack of thymus and parathyroid development.