The answer is Vitamin C otherwise known as Ascorbic acid. It is naturally present in some foods, added to others and available in dietary supplement. Fruits and vegetables are the best sources of vitam C. Citrus fruits, tomatoes and tomato juice and potatoes are major contributors of vitamin C.
Answer:
Unconditioned stimulus.
Explanation:
Classical conditioning may be defined as a type of learning procedure in which the biological procedure is used to pair up with the previous nerve stimulus. This stimulus result in the response of an individual.
The Pavlov experiment with the dog explains the process of classical conditioning. The ringing of bell (conditioned stimulus) is paired with unconditioned stimulus (meat presentation).
Thus, the meat presentation is unconditioned stimulus.