This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
In peripheral tissues which of the following contains substance P 
Select and explain. 
A. Plasma cell, B. Mast cell, C. Nerve terminal, D. Vascular endothelium
C: Nerve terminal
Answer: C: Nerve terminal 
Explanation: Substance P (SP) is an undecapeptide (a peptide composed of a chain of 11 amino acid residues) member of the tachykinin neuropeptide family. It is a neuropeptide, acting as a neurotransmitter and as a neuromodulator. Ref guyton and hall textbook of medical physiology 12/e pg 83