The answer is the first one (A): Enzyme-rich pancreatic juice.
Explanation for each option:
A. Enzyme-rich pancreatic juice - Correct. Pancreatic acinar cells are specialized cells in the pancreas that produce and secrete digestive enzymes. These enzymes are released into the pancreatic ducts and eventually into the small intestine to aid in digestion.
B. Glucagon - Incorrect. Glucagon is a hormone produced by the alpha cells of the pancreatic islets (Islets of Langerhans), not the acinar cells. It plays a role in regulating blood glucose levels.
C. Steroid hormones - Incorrect. Steroid hormones are not produced by the pancreas. They are typically produced by the adrenal glands, gonads, and other tissues.
D. Insulin - Incorrect. Insulin is a hormone produced by the beta cells of the pancreatic islets, not the acinar cells. It is crucial for regulating blood glucose levels.
In summary, pancreatic acinar cells are responsible for secreting enzyme-rich pancreatic juice, which is essential for the digestive process.