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
Major contribution towards gluconeogenesis is by? 
Select and explain. 
A. Lactate, B. Glyerol, C. Ketones, D. Alanine
D: Alanine
Answer: D: Alanine 
Explanation: D i.e. Alanine