ADA is an enzyme that is deficient in a genetic discovery SCID. What is the full form of ADA?

The correct option is C - Adenosine deaminase

ADA (adenosine deaminase) is an enzyme that is present in lymphocytes and is very important for the immune system to function. Its primary function in humans is the development and maintenance of the immune system.

Severe combined immunodeficiency (SCID) is a life-threatening syndrome of recurrent infections, diarrhoea, dermatitis, and failure to thrive that is caused by deficiency of the enzyme adenosine deaminase (ADA).

So, the correct option is 'Option B'.