Which enzyme is used as a 'clot buster'?

The correct answer is Option (3) → Streptokinase

Option (3) Streptokinase — Correct. A clot buster is an enzyme that dissolves blood clots. Of the options, only streptokinase, from the bacterium Streptococcus, is used this way; staphylokinase, glucokinase and protease are not named for it.

Note: A similar question was also asked in CUET (UG) 2025 on 14-05-2025 (Slot 2), and in CUET (UG) 2023 on 15-06-2023 (Slot 1).

NCERT Extract:
Chemicals, Enzymes and Other Bioactive Molecules – “… You must have noticed that bottled fruit juices bought from the market are clearer as compared to those made at home. This is because the bottled juices are clarified by the use of pectinases and proteases. Streptokinase produced by the bacterium Streptococcus and modified by genetic engineering is used as a ‘clot buster’ for removing clots from the blood vessels of patients who have undergone myocardial infarction leading to heart attack.”