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 following facilitates synaptic transmission of neurotransmitter 
Select and explain. 
A. Hypocalcemia, B. Botulinum toxin, C. Acidosis, D. Hypoxia
A: Hypocalcemia
Answer: A: Hypocalcemia 
Explanation: Hypocalcemia facilitates synaptic transmission.
Hypercalcemia, hypoxia, Botulinum toxin, tetanus toxin acidosis inhibits synaptic transmission.