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A 37-day-old baby presented to the Pediatrics ER with increased respiratory effo along with grunting. Mother says he is always irritable, feeds very poorly and has not gained weight. History of frequent respiratory infections in the past 2 weeks O/E, Wide pulse pressure along with bounding peripheral pulses Hyperkinetic apex Continuous murmur in 2nd left intercostal space. The structure involved in the above condition develops from which embryological structure: –

ALeft sixth arch
BRight sixth arch
CLeft fifth arch
DRight fifth arch
Unknown
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