A 47-year-old woman presents with severe lower back pain, bilateral leg weakness, saddle anaesthesia and urinary retention. What is the most appropriate immediate management?APrescribe oral opioids and arrange physiotherapyBArrange urgent MRI of the lumbosacral spine and neurosurgical referralCOrder plain lumbar spine X-rays and review in 1 weekDCommence non-steroidal anti-inflammatory drugs onlyEReassure that this is sciatica and will resolveCheck my answer