Question category: Neurology
A 64 year old gentleman presents with lower back pain following a recent fall. He has a history of osteoarthritis. He is also complaining of some weakness in his leg. On examination there is weakness of dorsi flexion of the ankle and extension of the big toe. Knee and ankle jerks are present. He also has reduced sensation over the lateral calf and dorsum of the foot. Which of the following is the predominant root involved?