All of the following are functions of the skin EXCEPT:

• A. Protection against pathogens
• B. Production of red blood cells
• C. Regulation of body temperature
• D. Synthesis of vitamin D

Answer: (B)

Verified step by step guidance

1. Understand the primary functions of the skin: The skin is the largest organ of the body and serves several critical functions, including protection against pathogens, regulation of body temperature, and synthesis of vitamin D.
2. Analyze the options provided: Review each option to determine whether it aligns with the known functions of the skin.
3. Option 1: 'Protection against pathogens' - This is a key function of the skin, as it acts as a physical barrier to prevent the entry of harmful microorganisms.
4. Option 2: 'Regulation of body temperature' - The skin helps regulate body temperature through mechanisms such as sweating and blood vessel dilation or constriction.
5. Option 3: 'Production of red blood cells' - This is not a function of the skin. Red blood cells are produced in the bone marrow, not the skin. Therefore, this is the correct answer to the question.