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
The reducing equivalent for fatty acid synthesis is derived from 
Select and explain. 
A. Glycolysis, B. Kreb's cycle, C. Urea cycle, D. pentose phosphate pathway
D: pentose phosphate pathway
Answer: D: pentose phosphate pathway 
Explanation: None