The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 2-month-old girl is brought to the pediatrician by her concerned father. He states that ever since her uncomplicated delivery she has failed to gain weight, has had chronic diarrhea, and has had multiple bacterial and viral infections. During the course of the workup, an absent thymic shadow is noted and a lymph node biopsy demonstrates the absence of germinal centers. Which of the following is the most likely cause of this patient's symptoms?   (A) Defect in ATM gene   (B) Adenosine deaminase deficiency   (C) NADPH oxidase deficiency   (D) Defect in BTK gene
['(B) Adenosine deaminase deficiency <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Defect in ATM gene \n (B) Adenosine deaminase deficiency \n (C) NADPH oxidase deficiency \n (D) Defect in BTK gene <> possible answers', "  A 2-month-old girl is brought to the pediatrician by her concerned father. He states that ever since her uncomplicated delivery she has failed to gain weight, has had chronic diarrhea, and has had multiple bacterial and viral infections. During the course of the workup, an absent thymic shadow is noted and a lymph node biopsy demonstrates the absence of germinal centers. Which of the following is the most likely cause of this patient's symptoms? <> context@"]