Answer: A
D82.1 is the correct code for this case because it codes for Di George syndrome. All the symptoms in the kid and the diagnosis clearly mentions this syndrome.
Option B is not correct because D82.2 is used to code for immunodeficiency with short-limbed stature.
Option C is not correct because D82.3 is used to code for immunodeficiency following a hereditary defective response to the Epstein Barr virus.
Option D is not correct because D82.4 is used to code for IgE syndrome.