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
Which acid is formed in the citric acid cycle? 
Select and explain. 
A. Oxaloacetic acid, B. Glutamic acid, C. Nitric acid, D. None of the above
A: Oxaloacetic acid
Answer: A: Oxaloacetic acid 
Explanation: None