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
A 2 years old child suffers flame burns involving face, bilateral upper limbs and front of chest and abdomen. What is the body surface area involved? 
Select and explain. 
A. 40%, B. 45%, C. 54%, D. 60%
A: 40%
Answer: A: 40% 
Explanation: Ans: A. 40%(Ref Sabiston 201e p507, 19/e p523; Schwaz 91e p199-200; Bailey 261e p389)The best way to measure the area burned accurately is the Lund and Browder cha.Total body surface area affected in burns of a 2 years old child involving face (8.5%), bilateral upper limb (20%), front of chest & abdomen (13%) is 41.5% (approximately 40%).