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 procedure should be performed after any handling of a plant sample in a lab?  
 (A) applying disinfectant to the counters (B) throwing away plant material in the trash (C) washing hands with an antibacterial soap (D) placing hands under an ultraviolet light
C

The relationship between ticks and a dog can best be described as  
 (A) mutualism. (B) competition. (C) parasitism. (D) commensalism.
C

The formula X + ZY -> XZ + Y shows that  
 (A) X and Y bonded into a more complex molecule. (B) ZY has decomposed into two smaller compounds. (C) X is a more reactive compound than Y. (D) Y has changed into a new compound.

C