This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
a drug that compete for active binding is called 
Select and explain. 
A. Competitive inhibitor, B. Non competitive inhibitor, C. Covalent inhibitor, D. Any of These
A: Competitive inhibitor
Answer: A: Competitive inhibitor 
Explanation: In competitive inhibition of enzyme catalysis, binding of an inhibitor prevents binding of the target molecule of the enzyme, also known as the substrate. This is accomplished by blocking the binding site of the substrate - the active site - by some means. Ref-KDT 7/e p39