In this task, you need to answer basic science questions. For each question, several terms are intentionally masked with ***. This masking can cover very few or many of the question words. Clearly, if masked terms are important, the modified question will be impossible to answer. Please indicate the correct answer with one of the following responses: "A", "B", "C", "D" or "E". While "A"-"D" correspond to the answer options provided in the input, "E" represents "I don't know" for questions that do not provide enough information. Respond via "E" if the question is not answerable. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D', 'E'.

Ex Input:
Question: *** purchased a *** for making a *** ramp. Which of the following is most *** to have for *** the *** ***?  (A) a picture showing the colors of different ramp parts (B) a diagram showing some ways to use the ramp (C) a list of prices for other available kits (D) a set of instructions for the kit material.

Ex Output:
E.


Ex Input:
Question: A student wants to find out how many different kinds of birds are found in a park. In addition to a bird *** ***, the student should use  (A) binoculars (B) goggles (C) a microscope (D) a hand len.

Ex Output:
A.


Ex Input:
Question: A class learns about weather. The students in the class measure the outside air *** at the same time each day. Which way of *** the *** would provide the most *** ***?  (A) taking the measurement in the shade (B) placing the thermometer on the ground (C) taking a measurement using a different tool each day (D) recording the measurements from three thermometer.

Ex Output:

D.