This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper Extremity, Subject name: Anatomy
[{'content': 'Actions of the lumbricals are- \nSelect and explain. \nA. Flexion at PIP and extension at DIP joints, B. Flexion at metacarpophalangeal and extension at PIP joints, C. Adduction of fingers, D. Abduction of fingers', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Flexion at metacarpophalangeal and extension at PIP joints Action of small muscles in handLumbricalsFlexion at metacarpophalangeal(MCP) and extension at PIP jointsDorsal InterosseiAbduction of fingersPalmar InterosseiAdduction of fingers", 'role': 'assistant'}]