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: Surgery
Yellow nodules over palm diagnosis 
Select and explain. 
A. implantation dermoid, B. sebaceous cysts, C. Corn, D. Melanoma
C: Corn
Answer: C: Corn 
Explanation: Answer- C. CornA corn is a localized keratosis of the skin. Histologically a corn is composed of keratin masse with intact basal layer.It usually occurs at the sites of frictional pressure on the sole, foot and toes. This often occurs due to ill fitting or tight shoes.Corn is thicker than callosity and causes more cofloent to the patient.