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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。

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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?