TASK DEFINITION: In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.
PROBLEM: Question: What type of hydrocarbon is coal? Answer: solid

SOLUTION: Solid type of hydrocarbon is coal.

PROBLEM: Question: Which crust lies deep inside the ocean? Answer: oldest

SOLUTION: Oldest crust lies deep inside the ocean.

PROBLEM: Question: Four electron groups orient themselves into what shape that has four faces? Answer: tetrahedron

SOLUTION:
Four electron groups orient themselves into tetrahedron shape that has four faces.