Which of the following is a feature of DiGeorge's syndrome?

DiGeorge's syndrome, also known as 22q11.2 deletion syndrome, is characterized by a range of clinical features, with one of the prominent manifestations being recurrent infections. This occurs primarily due to thymic hypoplasia or aplasia, which leads to T-cell immunodeficiency. The thymus is essential for the maturation of T cells, which are crucial components of the adaptive immune system. As a result, individuals with DiGeorge's syndrome often have a compromised immune response, making them more susceptible to various infections.

The other options do not accurately describe features of DiGeorge's syndrome. Hypokalemia, or low potassium levels, is unrelated to this syndrome. Hyperparathyroidism may occur in other genetic conditions, but DiGeorge's syndrome typically involves hypoparathyroidism due to parathyroid gland developmental issues. Additionally, the inheritance pattern of DiGeorge's syndrome is not autosomal dominant; it is associated with a chromosomal deletion, making it typically sporadic rather than following a classic Mendelian inheritance.