question_answer

Which one among the following is a useful microorganism?

(i) Salmonella typhi

(ii) Rhizobium

(iii) Lactobacillus

(iv) Rhinovirus

A) (i) and (ii)                      

B) (ii) and (in)

C) (iii) and (iv)                   

D) (i) and (iv)

E) None of these