This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glycolysis, Subject name: Biochemistry
ATP produced substrate level phosphorylation in glycolysis is: 
Select and explain. 
A. 5, B. 6, C. 4, D. 3
C: 4
Answer: C: 4 
Explanation: ATP yield substrate level phosphorylation in glycolysis is 4 ATPs There are 2 (SLP) steps in glycolysis: phospho glycerate kinase (Step - 7) pyruvate kinase (Step- 10) These steps occur in phase II of glycolysis. Number of ATPs produced are multiplied by 2 (as two molecules of Glyceraldehyde-3-P enters Phase II), i.e. total 2+2 = 4 ATPs .