This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Specific Cytogenetic Disorders, Subject name: Pathology
[{'content': 'Barr body is not seen in: \nSelect and explain. \nA. Klinefelter syndrome, B. Turner syndrome, C. Normal female, D. XXX syndrome', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Barr body, or X chromatin Inactive X can be seen in the interphase nucleus as a darkly staining small mass in contact with the nuclear membrane known as the. Number of Barr bodies = number of X chromosome -1 , Turner syndrome patients, number of Barr body = 1-1=0.', 'role': 'assistant'}]