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.

Ex Input:
Forests have been cut and burned so that the land can be used to raise crops. Which consequence does this activity have on the atmosphere of Earth?  
 (A) It reduces the amount of carbon dioxide production. (B) It reduces the production of oxygen. (C) It decreases the greenhouse effect. (D) It decreases pollutants in the air.

Ex Output:
B


Ex Input:
The weight of an object can change even when the mass stays the same. Which statement correctly identifies a relationship between mass and weight?  
 (A) The weight of an object depends on its mass and its volume. (B) Gravity affects the weight of an object but not its mass. (C) The mass of an object depends on its weight and size. (D) Magnetic fields can affect mass but not weight.

Ex Output:
B


Ex Input:
Sickle cell anemia is a condition that affects the shape of a red blood cell. An unaffected individual can be represented with the genotype AA. An affected individual can be represented with the genotype SS. Individuals that are carriers have the genotype AS. Which is the best description of sickle cell anemia?  
 (A) multiple alleles (B) incomplete dominance (C) homozygous recessive (D) heterozygous dominant

Ex Output:

B