Which of the following is a bacterial product?

In the formation of ascorbic acid,the micro-organism used is

Lactic acid is produced by

$A$ person is admitted to the hospital because they had a myocardial infarction. $A$ cardiologist injects them with 'streptokinase'. Why?

Match Column $I$ (Antibiotic) with Column $II$ (Source) and choose the correct option from the codes given below.

Column $I$	Column $II$
$A$. Fumagillin	$1$. Gliocladium virens
$B$. Bacitracin	$2$. Streptomyces griseus
$C$. Streptomycin	$3$. Bacillus polymyxa
$D$. Viridin	$4$. Aspergillus fumigatus
$E$. Polymixin	$5$. Bacillus licheniformis

Codes:
$A \quad B \quad C \quad D \quad E$

Which steroid is used for transformation?