This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
[{'content': 'Y-chromosomes is \nSelect and explain. \nA. Metacentric, B. Sub-metacentric, C. Acrocentric, D. Longer than the X-chromosome', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Acrocentric chromosome: A chromosome in which the centromere is located quite near one end of the chromosome.Humans normally have five pairs of acrocentric chromosomes. <a href=" syndrome</a> is caused by an extra acrocentric chromosome (chromosome21).', 'role': 'assistant'}]