This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
Nerve running along with profunda brachii aery, in spiral groove 
Select and explain. 
A. Ulnar, B. Median, C. Radial, D. Musculocutaneous nerve
C: Radial
Answer: C: Radial 
Explanation: The three nerves related to humerus:-1. Axillary nerve- at surgical neck2. Radial nerve-radial/spiral groove.3. Ulnar nerve-behind medial epicondyle.SPIRAL GROOVE:-Posterior surface of humerus Lodges profunda brachial vessels and radial nerve In the spiral groove, it hives off the following branches:-Lower lateral cutaneous nerve of the arm.Posterior cutaneous nerve of forearm.Nerve to lateral head of triceps.Nerve to medial head of tricepsNerve to anconeus.At the lower end of spiral groove, the nerve pierces lateral muscular septum of the arm and enters anterior compament of the arm.{Reference: Vishram Singh page no.24}