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: Pharmacology
Which of the following is true about parasympathetic nervous system? 
Select and explain. 
A. Ach is transmitter at both pre & post synaptic junction, B. It causes dilatation of skeletal muscles, C. Post-ganglionic fibres are longer than pre ganglionic fibres, D. Noradrenalin is the neurotransmitter at post ganglionic junction
A: Ach is transmitter at both pre & post synaptic junction
Answer: A: Ach is transmitter at both pre & post synaptic junction 
Explanation: None