This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pharmacology, Subject name: Pharmacology
A competitive antagonist is a substance that 
Select and explain. 
A. Interacts with receptors and produces submaximal effect, B. Binds to the same receptor site and progressively inhibits the agonist response, C. Binds to the nonspecific sites of tissue, D. Binds to one receptor subtype as an agonist and to another as an antagonist
B: Binds to the same receptor site and progressively inhibits the agonist response
Answer: B: Binds to the same receptor site and progressively inhibits the agonist response 
Explanation: In the presence of a fixed concentration of agonist, increasing concentrations of a competitive antagonist progressively inhibit the agonist responseBasic and clinical pharmacology Katzung 13th edition pg 23