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).

[Q]: Question: Which two senses would BEST help a person measure hair length?  (A) Taste and smell (B) Touch and sight (C) Sight and hearing (D) Smell and hearin?
[A]: B.


[Q]: Question: Which of the following converts electrical energy into motion?  (A) light switch (B) electric stove (C) light bulb (D) electric fa?
[A]: D.


[Q]: Question: What effect does a producer have on the food chain?  (A) It makes energy for the food chain. (B) It recycles material in the food chain. (C) It eats food in the food chain. (D) It stops the food chain from working?
[A]:
A.