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

Answer: C


Question: When a person speaks, the type of wave produced can be described as all these except  
 (A) transverse. (B) mechanical. (C) compression. (D) longitudinal.

Answer: A


Question: What is the difference between magma and lava?  
 (A) Magma is below ground. Lava is above ground. (B) Magma is cool. Lava is hot. (C) Magma comes out of earthquakes. Lava comes out of volcanoes. (D) Magma is solid. Lava is liquid.

Answer:
A