In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.

[Q]: Sentence: Although it is the easiest to observe, color is not ideal as a sole way to identify minerals. Question: Although it is the easiest to observe, what property is not ideal as a sole way to identify minerals?
[A]: color


[Q]: Sentence: A moving car is said to be in dynamic equilibrium when it is zero net force. Question: When is a moving car said to be in dynamic equilibrium?
[A]: zero net force


[Q]: Sentence: From viral infections did the first proto-oncogenes arise. Question: From what did the first proto-oncogenes arise?
[A]:
viral infections