Which of these would be an example of a "primary metabolite" fermentation product?

Question

Quizplus · Accepted Answer

Primary metabolites are directly involved in the normal growth, development and reproduction of the organism. Ethanol is produced during primary metabolism in yeast during alcoholic fermentation. Penicillin, streptomycin, bacitracin and erythromycin are all secondary metabolites produced by bacteria and fungi during their stationary phase of growth, and are not directly involved in normal metabolic processes.

Which of These Would Be an Example of a "Primary