Under what circumstances should morphine be used?

Morphine is an opioid analgesic indicated for the management of moderate to severe pain, particularly in combat situations where casualties may experience significant trauma. In the context of Tactical Combat Casualty Care (TCCC), its use is specifically recommended for non-shock casualties, or those who are stable and not showing signs of circulatory shock. This ensures that the medication can effectively alleviate pain without compromising the patient's overall condition.

Using morphine for mild pain relief is not appropriate, as there are typically other less potent analgesics that can manage mild pain more effectively and safely. Additionally, while it may be considered to use other forms of pain management like Oral Transmucosal Fentanyl Citrate (OTFC) prior to morphine, morphine does not have to be used exclusively after OTFC. It's also not advised to administer morphine for all combat-related injuries indiscriminately, as some injuries may not warrant opioid treatment, especially if it could risk the patient's stability or if they are showing signs of shock.

Thus, option B emphasizes the correct clinical scenario where morphine is beneficial: for managing more significant pain in patients who are stable enough to receive it safely.