A 4yo girl is found to have bounding pulse and continuous machinery murmur

A 4yo girl is found to have bounding pulse and continuous machinery murmur. What is the most
probable dx?
a. TOF
b. ASD
c. VSD
d. PDA
e. CoA
Ans. The key is D. PDA. [Continuous mechinary murmur is well known feature of PDA].