Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Did you know that blood is a tissue? Blood is a fluid connective tissue that is made up of red blood cells, white blood cells, platelets, and plasma. The cells that make up blood are pictured below ( Figure below ). The different parts of blood have different roles. Answer: plasma
Output:
Blood is made up of red blood cells, white blood cells, platelets, and what else?