This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
For the following dyslipidemias, select the most characteristic finding.Type III hyperlipoproteinemia. 
Select and explain. 
A. palmar plane xanthomas, B. triglycerides > 1000, C. subcutaneous extensor tendon xanthomas, D. low serum cholesterol
A: palmar plane xanthomas
Answer: A: palmar plane xanthomas 
Explanation: In the rare familial form, raised yellow plaques appear on palms and fingers, and reddish-yellow xanthomas occur on the elbows. This disorder is felt to be secondary to accumulation of abnormal chylomicron and very low-density lipoprotein (VLDL) remnants. It is probably due to inherited homozygous defects in Apo E-II structure.