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: Pharmacology
Drugs used in urea cycle disorders to reduce ammonia? 
Select and explain. 
A. Phenyl butarone, B. Phenyl butyrate, C. L - Carnitine, D. Isoleucin
B: Phenyl butyrate
Answer: B: Phenyl butyrate 
Explanation: Ans: B. Phenyl butyrate Urea cycle disorders are inherited disorders where ammonia is not turned into uric acid properly and so it builds up in the blood. Regular intake of sodium phenylbutyrate helps reduce the levels of ammonia.