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NBME 19 Answers

nbme19/Block 0/Question#0 (2.3 difficulty score)
Investigator does an experiment... third ...

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submitted by an_improved_me(16),

Pharyngeal arch question, or more easily understood as a DiGeorge question... The thymus arises from the 3rd arch, which is why in DiGeorge (loss of 3rd/4th) you have no thymus