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: Unknown
Muscle in extension compartment of forearm which causes flexion of elbow - 
Select and explain. 
A. Brachioradialis, B. Abductor pollicis longus, C. Extensor pollicis longus, D. Extensor carpi radialis longus
A: Brachioradialis
Answer: A: Brachioradialis 
Explanation: Ans: A