Physiology Which of the following groups of contrast agents may be safely injected intrathecally? A Water-soluble ionic monomers B Water-soluble non-ionic monomers C Water-soluble ionic dimers D Oil based iodinated contrasts 💡 Explanation Which of the following groups of contrast agents may be safely injected intrathecally? ✓ Correct Answer: B. Water-soluble non-ionic monomers