Streptokinase produced by bacterium Streptococcus is used for

The correct answer is Removing clots from blood vessels

Explanation:

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.

• Streptokinase is used to remove the blood clots that are formed in the blood vessels i.e acts like a clot buster.
• It is mainly used for people who have undergone myocardial infarction leading to heart attack.
• This helps in restoring the blood flow to the affected tissue.

Other Options:

• Curd production: Curd production involves the activity of lactic acid bacteria like Lactobacillus. The fermentation of lactose into lactic acid by these bacteria gives curd its texture and tangy taste.
• Ethanol production: Ethanol is produced by the fermentation of sugars by yeast, particularly Saccharomyces cerevisiae. 
• Liver disease treatment: This is incorrect. Streptokinase is not used for treating liver diseases. Treatments for liver conditions typically include medications like antivirals, immunosuppressants, or lifestyle changes, depending on the condition (e.g., hepatitis, cirrhosis).