This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology and Rheumatology, Subject name: Medicine
[{'content': 'Thymic hypoplasia is seen in \nSelect and explain. \nA. Digeorge syndrome, B. Common variable immunodeficiency, C. Ataxia telengiectasia, D. All', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. d (all). (Ref. Robbin's Patho, 6th - 173, 235, 691)Thymic abnormalities are classically described with DiGeorge syndrome, but hypoplasia of thymus can also be seen in ataxia telengiectasia and common variable immunodeficiency.Third and fourth pouch syndrome or DiGeorge fs syndrome or CATCH syndrome# Cardiac anomalies,# Absent thymus,# T cell deficiency,# Coarse dysmorphic facial features and# Hypocalcemic tetany.", 'role': 'assistant'}]