This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetic and genetic disorders, Subject name: Pediatrics
[{'content': 'Barr body is absent in female having \nSelect and explain. \nA. 46 XX genome, B. 45 X0 genome, C. 47 XXX, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Barr body is absent in those with genotype 45 XO . For a brr body to be present a minimum of 2 x chromosomes should be there . No of Barr body = no of x chromosomes - 1. Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]