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
[{'content': 'Which muscle causes adduction of wrist joint? \nSelect and explain. \nA. Flexor carpi radialis, B. Flexor carpi ulnaris, C. Flexor pollicis longus, D. Flexor digitorum profundus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Flexor carpi ulnaris Humeral head Ulnar head origin Medial epicondyle of humerus Medial aspect of olecranon process and posterior border of ulna inseion Pisiform bone , inseion prolonged to hook of hamate and base of fifth metacarpal bone nerve supply Ulnar nerve Actions Flexes and adducts the hand at the wrist. Reference page no 107,108- BD chauriasia- upper limb & thorax', 'role': 'assistant'}]