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: Biochemistry
Arginine enters TCA Cycle by forming which substrate 
Select and explain. 
A. Fumarate, B. α Ketoglutarate, C. Oxaloacetabe, D. Succinyl CoA
B: α Ketoglutarate
Answer: B: α Ketoglutarate 
Explanation: None