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.
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Question: Scientists discovered that although infectious bacteria may develop immunity to antibiotic medications, some bacteria are unable to resist certain peptides, which act as natural antibiotic substances inside the human body. This discovery led to the development of which new technology?
(A) artificial substances that mimic human peptides (B) antibiotics that can be absorbed through the skin (C) bacteria that attack antibiotic-resistant organisms (D) antibiotics that adapt in response to bacterial immunity

Answer: A

Question: A student performed this experiment: Four different types of seeds were planted in identical pots filled with the same kind and amount of soil. The pots were placed in a warm, sunny place and were given the same amount of water each day for a month. Which question about these seeds could be answered at the end of the month?
(A) Which seeds grew well in the dark? (B) Which seeds produced the tallest plants? (C) Which seeds survived in cold temperatures? (D) Which seeds needed the least amount of water?

Answer: B

Question: Part of the east coast of South America and the west coast of Africa have matching fossils within the same series of rock layers. This provides evidence that these two continents were once
(A) separated by a much larger ocean (B) joined together as one landmass (C) located near the North Pole (D) in a different hemisphere

Answer:
B