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: Pharmacology
[{'content': 'All of the following cross plasma membrane except: \nSelect and explain. \nA. Epinephrine, B. Thyroxine, C. Androstenedione, D. Estrogen', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]