When you eat a cupcake, the pancreas will be stimulated to release what hormone?

The correct answer is insulin.

Explanation:

The pancreas situated in the upper abdomen region acts as both a digestive exocrine gland and a hormone generating endocrine gland. The pancreas discharges the hormones glucagon and insulin to monitor the levels of sugar all through the day.  

Insulin is generated by the pancreas beta cells. This hormone helps to reduce the levels of sugar in the blood post-meal by instigating the captivation of glucose by muscle, liver, and adipose tissues. Thus, when one consumes a cupcake, the pancreas will release insulin hormone.