You are given a science question (hard-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

[Q]: Devil facial tumor disease (DFTD) is a disease that is decimating the population of Tasmanian devils. The disease passes from one animal to another through bites and is caused by parasites. The parasites cause cancerous tumors that spread throughout an infected animal's body and kill it. What is the best description of DFTD?  
 (A) a non-infectious, cell-cycle disease (B) an infectious, cell-cycle disease (C) a non-infectious, chronic disease (D) an infectious, chronic disease
[A]: B


[Q]: Anna's class counted the number of butterflies in the school garden for an assignment. Anna's results were different from the rest of the class. What should she do?  
 (A) Change the assignment. (B) Leave the results alone. (C) Match her results with the class. (D) Ask the teacher to count for her.
[A]: B


[Q]: Which marine ecosystem is independent of sunlight?  
 (A) estuary (B) whale fall (C) black smoker (D) open ocean
[A]:
C