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
Feature(s) of slow twitching muscle is/area) Contain large amounts of myoglobinb) Composed of smaller fibersc) Contain larger amount of glycolytic enzymed) White in coloure) It has high ATPase activity 
Select and explain. 
A. ac, B. ab, C. ad, D. bc
B: ab
Answer: B: ab 
Explanation: Characters of slow twitching muscles.
-        Myoglobin- High amount
-        Colour- Red
-        Fibres- Small
-        ATPase activity- Low
Glycolytic activity- Low