**Core Concept**
Tranexamic acid (TXA) is a synthetic lysine derivative that acts as a fibrinolysis inhibitor. It is used to prevent and treat excessive bleeding in various clinical settings, including surgery and trauma.

**Why the Correct Answer is Right**
TXA works by binding to plasminogen, the precursor to plasmin, and preventing its conversion to the active enzyme. This mechanism blocks the degradation of fibrin clots, thereby reducing bleeding. TXA also inhibits the activity of plasmin once it has been formed, further contributing to its antifibrinolytic effect.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because TXA does not work by stimulating platelet aggregation, which is a different mechanism of action associated with other medications like aspirin or clopidogrel.

**Option B:** This option is incorrect because TXA is not a direct inhibitor of plasmin. Instead, it binds to plasminogen and prevents its conversion to plasmin.

**Option C:** This option is incorrect because TXA does not work by increasing blood coagulation factors. Its mechanism of action is specific to the inhibition of fibrinolysis.

**Clinical Pearl / High-Yield Fact**
TXA is a useful adjunct in the management of bleeding in patients undergoing surgery, particularly in settings where bleeding is difficult to control. It is also used to treat excessive menstrual bleeding in women with heavy menstrual periods.

**Correct Answer: C. Inhibits conversion of plasminogen to plasmin.**