A :- Aerobic bacteria forms flocks by associating with michoriaza.
R :- Upper free water which remain over primary sludge is called effluent.
(a) Both A and R are true and R is correct explanation of A.
(b) Both A and R are true but R is not correct explantion of A.
(c) A is true but R is false.
(d) A is false but R is true.
