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': 'Which ONE of the following is TRUE about a competitive antagonism ? \nSelect and explain. \nA. Antagonism cannot be completely reversed by increased dose of the agonist, B. An agonist cannot displace an antagonists from the receptor, C. Agonists and antagonists bind to the same receptor, D. Dose–response curve of an agonists shifts to the left in the presence of an antagonist', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]