The Nurse Is Explaining to a Client That During Testing

The nurse is explaining to a client that during testing for arterial problems of his penis, an erection may occur that may not go away at first and he will need to be monitored until it has resolved or been medically reversed. What type of testing is this client undergoing?

A) Prostatic biopsy
B) Nocturnal penile tumescence tests
C) Prostate-specific antigen
D) Duplex Doppler ultrasonography