**Competitive Inhibition Explanation**

**Core Concept**
Competitive inhibition is a type of enzyme inhibition where an inhibitor molecule structurally resembles the substrate and competes with it for binding to the active site of the enzyme. This results in a reversible inhibition of enzyme activity, as the inhibitor can be displaced by increasing substrate concentrations.

**Why the Correct Answer is Right**
The correct answer is related to the concept of competitive inhibition, where the inhibitor competes with the substrate for binding to the enzyme's active site. This type of inhibition is reversible, meaning that increasing the substrate concentration can displace the inhibitor and restore enzyme activity. The enzyme-substrate-inhibitor complex has a similar structure to the enzyme-substrate complex, making it difficult to distinguish between the two. This is why competitive inhibitors can be overcome by increasing substrate concentrations.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because competitive inhibition is not an example of non-competitive inhibition, where the inhibitor binds to a site other than the active site and reduces enzyme activity regardless of substrate concentration.

**Option B:** This option is incorrect because competitive inhibition is not an example of uncompetitive inhibition, where the inhibitor binds to the enzyme-substrate complex and reduces enzyme activity.

**Option C:** This option is incorrect because competitive inhibition is not an example of irreversible inhibition, where the inhibitor covalently modifies the enzyme and permanently reduces enzyme activity.

**Clinical Pearl / High-Yield Fact**
Remember that competitive inhibitors can be overcome by increasing substrate concentrations, whereas non-competitive inhibitors cannot be overcome by increasing substrate concentrations.

**Correct Answer: C. Irreversible inhibition is not reversible by increasing substrate concentrations.**