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
Pyruvate can be converted into all of  the following in a single step except: 
Select and explain. 
A. Phosphoenol pyruvate, B. Alanine, C. Acetyl CoA, D. Lactate
A: Phosphoenol pyruvate
Answer: A: Phosphoenol pyruvate 
Explanation: None