Which of the following medications is used as a clot buster in emergencies?

Streptokinase is classified as a thrombolytic agent, commonly known as a "clot buster," used in emergency settings to dissolve blood clots that are blocking blood vessels, particularly in cases of acute myocardial infarction (heart attack) or pulmonary embolism. It works by activating plasminogen, which converts to plasmin and subsequently dissolves fibrin, the main protein component of blood clots.

While aspirin can play a role in the prevention of clot formation, especially in cardiovascular situations, it does not actively dissolve existing clots. Beta-blockers are primarily prescribed to manage heart rate and blood pressure, rather than for dissolving clots, and statins are used to lower cholesterol levels and reduce the risk of heart disease over the long term. Therefore, streptokinase is identified as the appropriate medication for emergency use to quickly address and resolve clot-related issues.