This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'DiGeorge’s syndrome is characterized by a deficiency of _____. \nSelect and explain. \nA. B lymphocytes, B. T lymphocytes, C. Both B and T lymphocytes, D. Antibodies', 'role': 'user'}, {'content': 'Answer: B \nExplanation: DiGeorge’s syndrome is characterized by a deficiency of T cells. It is caused by the failure of the third and fourth brachial pouches to develop normally, resulting in a lack of thymus and parathyroid development.', 'role': 'assistant'}]