15.The answer is b.(Sadler, pp 169–172. Moore and Persaud, Developing,
pp 354–355, 372–373. See diagram provided after the answer for question 14.)The
presence of a murmur could be indicative of any of the conditions. The pres-
ence of a continuous machine-like murmur is indicative of a patent ductus
arteriosus (PDA). Usually, as in this case, the premature baby with PDA does
Embryology: Early and General Answers 87