The rejection of organ transplant in humans is prevented by using

Which vitamin is produced by $Ashbya$ $gossypii$?

Statement $1$: Statins are blood cholesterol-lowering agents.
Statement $2$: They act by competitively inhibiting the enzyme responsible for the synthesis of cholesterol.

Choose the correct matching pair for the following table:

Column-$I$ (Microbe)	Column-$II$ (Product)
$(I)$ Aspergillus niger	$(p)$ Lactic acid
$(II)$ Acetobacter aceti	$(q)$ Acetic acid
$(III)$ Lactobacillus	$(r)$ Citric acid
$(IV)$ Clostridium butylicum	$(s)$ Butyric acid

Match the following columns:

List-$I$	List-$II$
$(a)$ Aspergillus niger	$(1)$ Lactic acid
$(b)$ Acetobacter aceti	$(2)$ Butyric acid
$(c)$ Clostridium butylicum	$(3)$ Acetic acid
$(d)$ Lactobacillus	$(4)$ Citric acid

Which of the following is used as a 'clot buster' to remove clots from the blood vessels of patients who have undergone myocardial infarction?