This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Muscle spared in ERB's palsy? 
Select and explain. 
A. Deltoid, B. Brachialis, C. Biceps, D. Coracobrachilis
D: Coracobrachilis
Answer: D: Coracobrachilis 
Explanation: Root value involved in ERB's palsy is C5 and C6 which gives supply to Axillary nerve & Musculocutaneous nerve.Coracobrachialis is supplied by C7 and hence spared.