Answer:
Cognitive process.
Step-by-step explanation:
Classical conditioning is a type of process of learning in which a neutral stimulus (lets call it CS) when paired with a stimulus that provokes a fixed response (unconditioned stimulus US) results in a conditioned response when the CS is presented. Like in the example, taking alcohol (CS), when paired with a nausea producing drug (US) produces the conditioned response. The cognitive process involves the linking, in this case, both stimulus in the mind, which is key to this process.