Final answer:
Thrombolytics are drugs that dissolve blood clots by activating plasminogen to convert it into plasmin.
Step-by-step explanation:
Thrombolytics are a class of drugs that dissolve blood clots. They work by activating plasminogen to convert it into plasmin, which is the enzyme that breaks down clots.
Tissue plasminogen activator (tPA) is an example of a thrombolytic agent. It is an enzyme that catalyzes the conversion of plasminogen to plasmin.
Therefore, the correct answer is d. Thrombolytics.