You are given a science question (easy-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.

What type of galaxy is the Milky Way?
(A) spiral (B) elliptical (C) irregular (D) oval
A

Which scientist is known for his genetics experiments with pea plants?
(A) Charles Darwin (B) Gregor Mendel (C) Carolus Linnaeus (D) Robert Hooke
B

A cell completes the synthesization of a protein by adding a carbohydrate to the protein's structure. At which site in the cell is the carbohydrate added?
(A) the nucleus (B) a ribosome (C) a mitochondrion (D) the Golgi apparatus
D