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.

Example Input: A gene mutates in a type of bacteria. When these bacteria reproduce asexually, this mutation can only be inherited by  
 (A) different types of bacteria. (B) cells in the bacteria that are non-reproductive. (C) bacteria cells that are missing the gene. (D) direct descendants of the bacteria.
Example Output: D

Example Input: 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
Example Output: A

Example Input: The use of television has improved safety by  
 (A) using larger screens with better color. (B) explaining how to avoid pressure from commercials. (C) providing a setting that encourages people to exercise more. (D) warning people of dangers such as bad weather or accidents.
Example Output:
D