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:
If 100 grams of vinegar and 5 grams of baking soda are poured in a container, a small amount of gas will be produced. What will the final mass of the products be if the gas is trapped in the container?  
 (A) 100 grams (B) 104 grams (C) 105 grams (D) 110 grams

Ex Output:
C


Ex Input:
In mice, a certain species displays incomplete dominance in coat coloring. The offspring of a black (BB) mouse and a white (bb) mouse are gray (Bb) mice. A cross between two gray mice will most likely produce offspring with which percent of coat colors?  
 (A) 25% black, 75% gray (B) 25% gray, 75% white (C) 25% white, 25% black, 50% gray (D) 25% gray, 25% black, 50% white

Ex Output:
C


Ex Input:
Safe practices in the laboratory include all of these except  
 (A) tying back long hair. (B) wearing safety goggles. (C) performing each step quickly. (D) wiping up spills immediately.

Ex Output:

C