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: Physiology
[{'content': 'Autocrine hormone among the following: \nSelect and explain. \nA. Prostaglandins, B. Thromboxane A2., C. Both, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: They both are autocrine or paracrine hormones.', 'role': 'assistant'}]