This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'All of the following are present in the acrosomal head of spermatozoa except? \nSelect and explain. \nA. alkaline phosphatase, B. acid phosphatase, C. acrosomase, D. hyaluronidase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]