This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Thymic hypoplasia is seen in which of the following? \nSelect and explain. \nA. Wiskott-Aldrich syndrome, B. Digeorge syndrome, C. IgA deficiency, D. Agammaglobulinemia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: DiGeorge syndrome/Thymic hypoplasia/Velocardiofacial syndrome T cell deficiency Failure of devt of 3rd & 4th pharyngeal pouches Individuals have Variable loss of T cell mediated immunity - hypolastic thymus Tetany - lack of parathyroids Congenital defects of hea & great vessels T cell zones of lymphoid organs are depleted Deletion of gene mapped to chr 22q11', 'role': 'assistant'}]