This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Physiology
Hardest tissue in humans 
Select and explain. 
A. Enamel, B. Bone, C. Muscle, D. Skin
A: Enamel
Answer: A: Enamel 
Explanation: Ans: a (Enamel)Hardest tissue in humans is enamel.