The phrase "an essential answer" is correct and usable in written English.
It can be used when referring to a response that is crucial or necessary for understanding or resolving a situation.
Example: "In order to move forward with the project, we need an essential answer regarding the budget allocation."
Alternatives: "a crucial response" or "a vital answer".
Unions are a predictable (though still essential) answer.
But the essential answer lies in what seems to be the most mechanical example.
When asked, for instance, to explain "why you are a serious candidate and what your qualifications are to be commander-in-chief," Trump's essential answer was: "Obviously, I'm doing pretty well.
For example, DNA as the genetic material and the nature of genes were the best-covered concepts for any category on our benchmark list (concepts 1 and 2, Table 1); however, only a minority of students gave complete or essential answers to a question dealing with these ideas on the 2000 NAEP.
We can't anticipate what intellectual discoveries will become essential answers to the public's future questions.
Human biomonitoring has become an essential tool for answering many questions regarding exposure and effect (Budnik and Baur, 2009).
His shows "flesh out human contradictions rather than push an agenda" and strive to answer an essential question: "How the hell do we want to grow up as queer people, to survive, with respect to community politics?" The answer, he adds, "can make or break a queer person".
Thus, an essential, if not primary, answer to Mr. Brooks's question, "What is a university for?," should be promoting knowledge and understanding for their own sake — beyond any relevance to a job — and educating thoughtful, caring citizens who have the skills and motivation for helping advance the well-being and flourishing of individuals and communities.
In population genetics, change over a generation is sometimes the quantity of interest, and even when it is not (such as when the goal is to calculate fixation probabilities), change in allele frequency is an essential part of the answer (e.g. it defines M (p) in a diffusion equation).
