Which organism is used to obtain the enzyme known as a 'clot buster'?

Penicillin was discovered by

Which of the following enzymes are used to clarify fruit juices?
$(i)$ Lipase
(ii) Protease
(iii) RNase
(iv) Pectinase

Which of the following organic acids is produced by fermentation?

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?

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