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
Function of lumbricals area) Flexion at MCP jointb) Extension at IP jointsc) Adduction of the fingersd) Abduction of the fingers 
Select and explain. 
A. ac, B. bc, C. bd, D. ab
D: ab
Answer: D: ab 
Explanation: Lumbricals :

Flexion - Metacarpophalangeal joints.
Extension - Interphalangeal joints.