This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
[{'content': 'Normal testicular development requires which of the following chromosomes \nSelect and explain. \nA. XY, B. XX, C. Y chromosome, D. X chromosome', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The Y chromosome is one of two sex-determining chromosomes (allosomes) in mammals, including humans (the other is the X chromosome). In mammals, the Y-chromosome contains the gene SRY, which triggers testicle development if present. The human Y chromosome is composed of about 50 million base pairs. DNA in the Y chromosome is passed from father to son, and Y-DNA analysis may thus be used in genealogical research.Ref: Ganong&;s review of medical physiology; 24th edition; page no:-419', 'role': 'assistant'}]