Abnormalities of the thymus and superior and inferior parathyroid glands are exhibited by infants suffering from DiGeorge syndrome. These specific malformations indicate that DiGeorge syndrome affects development of which of the following pharygeal pouches?
A. 1st only
B. 1st and 2nd
C. 2nd and 3rd
D. 3rd only
E. 3rd and 4th

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