This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
Most common area of pressure sore is 
Select and explain. 
A. Ischium, B. Greater trochanter, C. Sacrum, D. Heel
A: Ischium
Answer: A: Ischium 
Explanation: Pressure sore frequency in descending order Ischium Greater trochanter Sacrum Heel Malleolus (lateral than medial) Occiput Bailey and Love 27e pg: 29