This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sources of blood glucose, Subject name: Biochemistry
Which of the following pathway is the major energy providing pathway for fast-twitch muscle? 
Select and explain. 
A. Glycolysis, B. b oxidation of fatty acids, C. Utilisation of ketone bodies, D. Amino acid breakdown
A: Glycolysis
Answer: A: Glycolysis 
Explanation: Muscle fibers are classified into:- type I (slow twitch, oxidative) type II (fast twitch, glycolytic) Muscle Fibers type TYPE I TYPE II Color Red White Protein/Organelle rich in myoglobin contains a large number of mitochondria lacks Myoglobin contains few mitochondria Metabolism Aerobic (use free fatty acids during rest) Anaerobic (use glycolysis primarily for their energy) Contraction duration Sustained Sho