You are presented with the question "Chondrocytes contain which type of protein?" and the following answer choices: 
- Actin
 - Keratin
 - white
 - allow growth
 - Collagen
 - ligt
 - positive
 - Hemoglobin

Now knowing that cartilage is a tough tissue that contains a protein called collagen and cartilage cells are called chondrocytes in mature cartilage, choose the best answer.


 

     Collagen    