Which of the following is not a communicable disease?

Alcohol can be converted into vinegar by the action of micro-organisms called:

The first antibiotic called penicillin was extracted from:

Which of the following is not a communicable disease?

(A) Lactobacillus bacteria

(B) Rhizobium bacteria

(C) Spirogyra algae

(D) Blue-green algae

Which of the following cannot be used as a food preservative?