This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Anatomy
[{'content': 'During spermiogenesis, mitochondrion of spermatid forms which pa of the sperm \nSelect and explain. \nA. Acrosomal cap, B. Middle piece, C. Axial filament, D. Head of the sperm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Nuclear body forms Head of the sperm Golgi body forms Acrosomal cap Mitochondrion forms Middle piece of sperm Microtubules form Axial filament of sperm.', 'role': 'assistant'}]