Lily Is Seeing Her Dentist for a Routine Checkup, and Finds

Multiple Choice

Lily is seeing her dentist for a routine checkup, and finds it is time for updated dental x-rays. Her dentist asks Lily if she is pregnant because, in terms of teratogenic effects, x-ray radiation is an example of:

A) a prescription drug.
B) an environmental hazard.
C) a maternal disease.
D) a paternal factor.