This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Back region, Subject name: Anatomy
A 24-year-old woman comes to a hospital to deliver her baby. Her obstetrician uses a caudal anesthesia during labor and childbih to block the spinal nerves in the Epidural space. Local anesthetic agents are most likely injected which of the following openings? 
Select and explain. 
A. Interveebral Foramen, B. Sacral Hiatus, C. Veebral canal, D. Dorsal Sacral Foramen
B: Sacral Hiatus
Answer: B: Sacral Hiatus 
Explanation: Caudal (epidural) anesthesia is used to block the spinal nerves in the epidural space by injecting local anesthetic agents the sacral hiatus located between the sacral cornua. An interveebral foramen transmits the dorsal and ventral primary rami of the spinal nerves. The veebral canal accommodates the spinal cord. Dorsal and ventral sacral foramina transmit the dorsal and ventral primary rami of the sacral nerves.