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: Biochemistry
Example of peptide chemical transmitter of GIT which is secreted in a paracrine fashion is: 
Select and explain. 
A. Gastrin, B. Secetin, C. Somatostatin, D. Histamine
C: Somatostatin
Answer: C: Somatostatin 
Explanation: Chemical trasmitters of GIT can be classified as: 1. Endocrine 2. Paracrine 3. Neurocrine 4. Autocrine Typical example of a paracrine signaling is seen in somatostatin. Another example is Histamine. Peptide among these two is Somatostatin where as histamine is a non peptide. Ref: Sleisenger and Fordtrans, Edition-9, Page-3.