A nurse is teaching a client who has a prescription of a nasogastric tube (NG) to treat a pyloric obstruction. Which of the following rationales for the use of the nasogastric tube should the nurse include in the teaching?

Rationale: A. A nasogastric (NG) tube is often used to decompress the stomach in conditions like pyloric obstruction. By removing accumulated gastric secretions and gas, it relieves pressure, nausea, and vomiting and prevents further distention. B. While NG tubes can be used to administer medications, this is not the primary purpose in the treatment of a pyloric obstruction. C. Supplying nutrients via tube feedings is typically done with a feeding tube, not for gastric decompression in obstruction. D. Determining the pH of gastric secretions may be performed for diagnostic purposes, but it is not the main rationale for using an NG tube in this situation.