A 30-year-old woman is found to have a congenital immunodeficiency that has remained largely asymptomatic throughout her life. Which of the following is the most likely diagnosis?
(A) Adenosine deaminase deficiency
(B) Chronic mucocutaneous candidiasis
(C) Purine nucleoside phosphorylase deficiency
(D) Selective IgA deficiency
(E) Wiskott-Aldrich syndrome
