This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Basics of DNA, Subject name: Biochemistry
[{'content': 'Which of the following is an example for facultative heterochromatin? \nSelect and explain. \nA. Centromere, B. Telomere, C. Barr body, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Heterochromatin is of two types: Constitutive heterochromatin Facultative heterochromatin Centromeric DNA Telomeric DNA Barr body (condensed X-chromosome) Condensed, inactive Decondenses during gametogenesis', 'role': 'assistant'}]