This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Anatomy
A 35 year old pregnant female at 40 weeks gestational age presents with pain and regular uterine contractions every 4-5 min. On arrival,the patient is in lot of pain and requesting relief immediately. Her cervix is 5cm dilated. What is the most appropriate method of pain control for this patient? 
Select and explain. 
A. Intramuscular morphine, B. Pudendal block, C. Local block, D. Epidural block
D: Epidural block
Answer: D: Epidural block 
Explanation: When complete relief of pain is needed throughout labour,epidural analgesia is safest and simplest. Ref: Williams Obs 24e pg 513 .