This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic histology, Subject name: Anatomy
[{'content': 'which pa of sperm helps in penetration of zona pellucida ? \nSelect and explain. \nA. head, B. middle piece, C. neck, D. acrosome', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Acrosome have acrosin enzyme which helps in penetration. Mitochondria is present in middle pa.', 'role': 'assistant'}]