instruction:
In this subtask, you will answer a simple science question. Please indicate the correct answer. If you're not sure about the answer, choose the last option "I don't know". Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D', 'E'. The "A"-"D" responses correspond to the answer options mentioned in the input. There is a 5th option "E" which should be used for questions for which you're not sure about the answer (e.g., when the questions do not provide enough information to answer).
question:
Question: Which cells help to destroy pathogens such as bacteria that enter the human body?  (A) red blood cells (B) liver cells (C) white blood cells (D) brain cell?
answer:
C.


question:
Question: A student is holding a ball. How can the student increase the kinetic energy of the ball?  (A) warm it in sunlight (B) throw it (C) remove the surface of the ball so that the energy is released (D) expose it to fir?
answer:
B.


question:
Question: What are the bundles of chemicals in our body called that control what we look like?  (A) cells (B) genes (C) DNA (D) filament?
answer:

B.