This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Anatomy
Hand deformity presennting as hyper-extension at the metcarpo phalaogeal joint and flexion at inter-phalanngeal joint, occurs due to paralysed 
Select and explain. 
A. Flexor digitorum profundus, B. Lumbricals, C. Lumbricals and interossei, D. Extensor digitorum
C: Lumbricals and interossei
Answer: C: Lumbricals and interossei 
Explanation: Interossei and lumbricalsflexes MCP (metacarpophallangeal joint) and extend IP (interphallangeal joint). Injury to interossei and lumbricals leads toclaw hand (extended MCP and flexed IP)