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: Physiology
The properties of fast twitch muscle area) Extensive sarcoplasmic reticulumb) Extensive blood supplyc) Large glycolytic pathwayd) Abundant mitochondriae) Made up of large number of small fibres with some long fibre muscles. 
Select and explain. 
A. ac, B. bc, C. ad, D. b
A: ac
Answer: A: ac 
Explanation: Characters of fast twitching muscles.
-        Mitochondria- low
-        Blood supply- normal
-        Fibres- Large
-        Sarcoplasmic reticulum- extensive
Glycolytic activity- high