Answer:
b. Benzodiazepines enhance pain relief attained with opioids and cause sedation.
Explanation:
Barbiturates are used in latent labor for their minor tranquilizng and sedative effects. They can also be used just before general anesthesia, if required. Ataractics are opioid agonists used to decrease anxiety, nausea, and vomiting. Opioids may be given IV, intrathecally, or epidurally.