Which of the following is correct about SCID?

A. Common in children as well as in adults

B. It is an immune disorder

C. Is due to deficiency of adenosine deaminase

D. Both B and C

Explanation: Severe combined immunodeficiency (SCID) is a group of rare disorders caused by mutations in different genes involved in the development and function of infection-fighting immune cells. Infants with SCID appear healthy at birth but are highly susceptible to severe infections.

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