This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
Excessive eating followed by purging using laxatives in 20 years old females: 
Select and explain. 
A. Bulimia nervosa, B. Anorexia nervosa, C. Binge eating disorder, D. Schizoprenia
A: Bulimia nervosa
Answer: A: Bulimia nervosa 
Explanation: Bulimia Nervosa