Which one of the following proteins is present in human hair and nails?

Which of the following is the smallest bone in the human body?

Which one of the following salts is found in maximum amount in the human bones?

Which one of the following is NOT a component of human male reproductive system ?

In the human digestive system, which one among the following is the role of the pancreas ?

Which one of the following statements best describes the role of B cells and T cells in the human body?