Which of the following substances act as a Nitric Oxide donor, PDE inhibitor, Carbon monoxide, Alcohol, Monosodium glutamate, Cocaine, Histamine, CGRP, and Exogenous hormone?
1) Nitric Oxide donor
2) PDE inhibitor
3) Carbon monoxide
4) Alcohol
5) Monosodium glutamate
6) Cocaine
7) Histamine
8) CGRP
9) Exogenous hormone