Hydroxyprogesterone is produced from which of the following?

Which of the following is used as an immunosuppressive agent?

Identify the blank spaces $a, b, c$ and $d$ given in the following table and select the correct answer.

Type of microbes	Scientific name	Commercial product
Bacterium	$a$	Clot buster enzyme
$b$	Aspergillus niger	Citric acid
Fungus	Trichoderma polysporum	$c$
Bacterium	$d$	Butyric acid

Selman Waksman received the Nobel Prize for the discovery of which antibiotic?

Streptokinase is used for ......... .

Read the following statement having two blanks $(A$ and $B)$:
$A$ drug used for $A$ patients is obtained from a species of the organism $B$. It helps in clearing blood clots inside the blood vessels.
The one correct option for the two blanks is: