.......... are used in detergent formulations and are helpful in removing oily stains from the laundry.

Mention the contribution of microbes in the production of antibiotics.

Which organism is rich in riboflavin?

Which country uses ethanol as a fuel?

Match the following (column-$I$ with column-$II$):

Column-$I$ (Microbes)	Column-$II$ (Organic acid)
$a$. Aspergillus niger	$(i)$ Butyric acid
$b$. Clostridium butylicum	$(ii)$ Citric acid
$c$. Acetobacter aceti	$(iii)$ Lactic acid
$d$. Lactobacillus	$(iv)$ Acetic acid

Read the sentence with two blanks ($a$ and $b$): "The medicine used for patients of .....$(a)$..... is obtained from the species of organism .....$(b)$.....". Which is the correct option for the two blanks?