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
Phenylbutazone use as an NSAID is restricted because : 
Select and explain. 
A. It has lower anti-inflammatory efficacy than other NSAIDs, B. It has potential to cause agranulocytosis, C. It has weak analgesic action, D. It alters the protein binding and metabolism of many drugs
B: It has potential to cause agranulocytosis
Answer: B: It has potential to cause agranulocytosis 
Explanation: None