Question

Which is source of Vitamin $B_{12}?$

• A. Pseudomonas
• B. Spirulina
• C. Nostoc
• D. Oscillatoria

Answer 1

The correct option is B Spirulina

Spirulina is, in some ways, similar to bacteria that create Vitamin $B12$ in the soil, though it's actually an evolutionary branch-off. The same formation of Vitamin $B12$ can take place in spirulina as a Vitamin $B12$ (culture) laboratory vat.

So, the correct option is 'Spirulina'.