I knocked at the front door and there was no answer.

我敲了前门，没有应答。

《柯林斯英汉双解大词典》

The truth of the matter is that most of these decisions are impossible to get right - because there is no correct answer, and there is no way of knowing the correct answer.

事情的真相是，绝大部分的决定都无法是正确的-因为没有绝对正确的回答，并且我们没有获得正确答案的方法。

youdao

But as their profiles suggest, there is no easy answer to that question, and there may be no answer at all.

但是通过他们的档案来看这个问题似乎没有答案。

youdao

The markets ask what they are going to do with Greece and there is no convincing answer.

BBC: The Greek conundrum

In traditional news, you will find that more often than not, there actually is a correct answer and there is no gray area.

FORBES: Fox News Viewers Uninformed, NPR Listeners Not, Poll Suggests

Keep in mind that because mania is only a word we use to describe certain types of behavior and emotions, there is no clear answer to your question of where mania stops and a temper tantrum begins.

CNN: Can a manic episode look like a tantrum?