Answer:
habituation
Explanation:
Jerome is very fond of pizza and she loves to eat Pizza. On getting the smell of the pizza, Jerome's mouth start to water or salivates.
Every day, Jerome, after class while going home by walking starts watering his mouth when he gets the smell of his favorite delicious pizza Steel’s Pizza House.
His mouth also salivates when one day he rides the bus while going home from class after seeing the Steel’s Pizza House sign.
Thus it is obvious in his brain that Jerome's mouth starts to water when he gets the smell of the delicious pizza from Steel’s Pizza House or when he sees the sign board of the Steel’s Pizza House.
Thus the answer is habituation.