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: Biochemistry
[{'content': 'Saturated aceyl enzyme formation causes: \nSelect and explain. \nA. Freeing of PAN-SH site, B. Freeing of Cyst - SH site, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Freeing of PAN-SH site', 'role': 'assistant'}]