This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Death and postmortem changes, Subject name: Forensic Medicine
[{'content': 'Stain used to stain X chromosome \nSelect and explain. \nA. Quinacrine, B. Acriflavin Schiff reagent, C. Methylene blue, D. Fluorescent green', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Barr body is formed due to random inactivation or condensation of one of the 2 female chromosomes in all the somatic cells of female mammals. Buccal smears are known to be potential source of Barr bodies. Acriflavin schiff stain was used in staining these Barr bodies. Ref: NCBI.org', 'role': 'assistant'}]