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
[{'content': 'Which of the following is true about parasympathetic nervous system? \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]