This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculo Skeletal Disorders, Subject name: Pediatrics
Phocomelia is a problem affecting: 
Select and explain. 
A. Long bones, B. Skull bones, C. Carpals, D. Metacarpals
A: Long bones
Answer: A: Long bones 
Explanation: a. Long bones(Ref: Nelson's 20/e p 3423)Phocomelia is a birth defect in which the hands and feet are attached to abbreviated arms & legs. The term comes from phoco (meaning 'seal') & melia (meaning limb'), to indicate that a limb is like a seal's flipper; One of the important cause is exposure of fetus to thalidomide.