Gastric glands are specialized glands located in the stomach. These glands secrete gastric juice, which contains hydrochloric acid (HCl) and enzymes like pepsin, which help in the digestion of food. Therefore, option (B) is correct.
Step 1: Small intestine.
The small intestine is the site of nutrient absorption, but gastric glands are not located there. The secretion of digestive enzymes occurs in the small intestine, but the gastric glands are found in the stomach. So, option (A) is incorrect.
Step 2: Pancreas.
The pancreas secretes pancreatic juices that contain digestive enzymes, but it does not contain gastric glands. Therefore, option (C) is incorrect.
Step 3: Large intestine.
The large intestine is involved in water absorption and the formation of feces, but it does not have gastric glands. Therefore, option (D) is incorrect.
Step 4: Conclusion.
The gastric glands are located in the stomach. The correct answer is (B).