As a serious dancer, Petra watches what she eats. She knows that she is underweight, but fears that if she starts eating more, she will get fat. In addition to a preoccupation with food, she has also stopped menstruating. Petra's behaviors suggest that she might be suffering from __________.
A. anorexia nervosa
B. bulimia nervosa
C. compulsive exercise
D. phobic disorder
Answer: A
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