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
Burns involving skin superficial part of dermis is categorized as 
Select and explain. 
A. First degree burns, B. Superficial 2nd degree burn, C. Deep 2nd degree burn, D. Third degree burns
B: Superficial 2nd degree burn
Answer: B: Superficial 2nd degree burn 
Explanation: First degree burns involve only epidermis
Superficial second degree involve upper layer of dermis
Deep second degree involves reticular layers of dermis
Third degree involves all layers of skin
Fourth degree burns involve not only skin but also subcutaneous fat and deeper structures