Final answer:
The scenario described in the question illustrates the primacy effect. This cognitive bias explains why Dinesh is able to remember the first three items on the grocery list.
Step-by-step explanation:
The scenario described in the question illustrates the primacy effect. The primacy effect is a cognitive bias where individuals have a better memory for items that are presented first in a list. In this case, Dinesh is able to remember the first three items on the grocery list because they were presented to him first by his wife. This happens because the items have a higher chance of being encoded into long-term memory due to the greater attention and rehearsal they receive.