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
Palmar surface of hand represents: 
Select and explain. 
A. 1% of total body surface area, B. 2% of total body surface area, C. 3% of total body surface area, D. 4% of total body surface area
A: 1% of total body surface area
Answer: A: 1% of total body surface area 
Explanation: Ans. A: 1% of total body surface area The use of a patient's own hand as a tool to estimate the area of burn injury is well documented. The area of the palmar surface of one hand has been estimated to be 1 percent of the body surface area.