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
True statement about glycolysis is: 
Select and explain. 
A. Occurs in mitochondria, B. Complete breakdown of glucose, C. Conversion of glucose to 3C units, D. 3 ATPs are used in anaerobic pathway
C: Conversion of glucose to 3C units
Answer: C: Conversion of glucose to 3C units 
Explanation: Option 1. Glycolysis occur in cytosol.
Option 2. Complete breakdown of glucose happens when pyruvate formed by glycolysis undergo pyruvate dehydrogenase reaction, followed by TCA Cycle.
Option 4. In anaerobic glycolysis.

Number of ATPs produced is 4.
Number of ATPs used is 2.
Net ATP yield by anaerobic glycolysis is 2.