A nurse is reviewing the plan of care for a group of clients. The nurse should identify that informed consent is required for which of the following procedures?

A. Insertion of a nasogastric tube: While informed consent is important for many procedures, the insertion of a nasogastric (NG) tube is generally considered a routine procedure that may not require formal informed consent unless specific complications or risks are involved. B. Administration of an iron injection using Z-track technique: Informed consent is typically required for procedures with inherent risks or invasive elements, but routine administration of iron injections is not typically classified as needing informed consent, unless there are specific concerns. C. Irrigation of a wound with antibiotic solution: Irrigation of a wound is typically a low-risk procedure, and although it is important to inform the client about the treatment, it generally does not require formal informed consent unless there are complications or risks involved. D. Placement of a central venous catheter: Informed consent is required for the placement of a central venous catheter, as it is an invasive procedure with potential risks such as infection, bleeding, and damage to blood vessels. This procedure requires the nurse to obtain and document the client's consent before proceeding.