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
Group B muscle fibres are 
Select and explain. 
A. Sympathetic preganglionic, B. Sympathetic post ganglionic, C. Parasympathetic preganglionic, D. Parasympathetic post ganglionic
A: Sympathetic preganglionic
Answer: A: Sympathetic preganglionic 
Explanation: None