Give some stream of consciousness and then the answer. For example, a Brnsted-Lowry model for the dissociation of hydrochloric acid (HCl) in aqueous solution would be the following:

Based on this passage, hcl is an example of an acid or base?
The relevant sentence in the passage is: For example, a Brnsted-Lowry model for the dissociation of hydrochloric acid (HCl) in aqueous solution would be the following:
Therefore, the answer is acid.