The full form of $SCP$ is ..........

Which organism's filaments are used in the production of Single Cell Protein $(SCP)$?

Consider the following four statements $(A-D)$ and select the option which includes all the correct ones only.
$(A)$ Single cell $Spirulina$ can produce large quantities of food rich in protein,minerals,vitamins,etc.
$(B)$ Body weight-wise,the microorganism $Methylophilus$ $methylotrophus$ may be able to produce several times more proteins than the cows per day.
$(C)$ Common button mushrooms are a very rich source of vitamin $C$.
$(D)$ $A$ rice variety has been developed which is very rich in calcium.

Which of the following is grown on a global scale to obtain Single Cell Protein $(SCP)$?

Spirulina is a

Which microorganism produces 200 g of protein in a single day?