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: Pathology
Positive nitrogen balance is seen in: 
Select and explain. 
A. Pregnancy, B. Kwashiorkar, C. Fever, D. Marasmus
A: Pregnancy
Answer: A: Pregnancy 
Explanation: Pregnancy is a state of anabolism and it shows positive nitrogen balance.