This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Classification and metabolism of amino acids, Subject name: Biochemistry
All of the following are conditions associated with negative nitrogen balance, EXCEPT: 
Select and explain. 
A. Burns, B. Convalescence, C. Infection, D. Malnutrition
B: Convalescence
Answer: B: Convalescence 
Explanation: Healthy adults will be at a state of nitrogen equilibrium, i.e. nitrogen intake = Nitrogen excreted. A high protein intake does not lead to positive nitrogen balance since high-protein intake also leads to protein degradation. Large intake of proteins is not advised since protein synthesis and protein degradation are energy-expensive processes. Positive Nitrogen Balance Negative nitrogen balance Intake is more than loss (Nitrogenintake > nitrogen excreted) Childhood growth Pregnancy Lactation Recovery after illness (Convalescence) Anabolic steroid intake Loss is more than the intake (Nitrogen excreted > Nitrogen intake) Infection Surgery Burns Trauma Malnutrition Hypehyroidism, Cushing syndrome