Correct Answer: C

Rationale: Inserting a nasogastric tube is a priority intervention for a client with peptic ulcer disease to decompress the stomach.

Correct Answer: A

Rationale: Irrigating the nasogastric tube is typically not recommended after a Billroth II procedure unless specifically ordered by a physician due to the risk of disrupting the surgical site.

Correct Answer: A

Rationale: Eating small, frequent meals helps prevent esophageal reflux.

Correct Answer: B

Rationale: Lactase is produced in the small intestine and aids in splitting neutral fats into glycerol and fatty acids. Lipase, amylase, and trypsin are produced in the pancreas and aid in the digestion of fats, starches, and proteins, respectively.

Correct Answer: C

Rationale: The correct answer is C, 'Barium swallow.' A barium swallow should be done after a barium enema or gallbladder series to prevent the contrast used in the barium swallow from obstructing the view of other organs. It takes several days for swallowed barium to pass completely out of the gastrointestinal tract. Choices A, B, and D are incorrect because a barium swallow should be the last test performed to ensure clear imaging without interference from residual contrast material.