Causal antecedent question

A Causal antecedent question requires a long answer. Causal antecedent questions are formed according to the following abstract specification: "What state or event causally led to an event or state?". An example of causal antecedent question would be: "How did this experiment fail?"

Example (1):

-Explainer:	["So what's your major?"]
-Explainee:	['Chemical engineering.']
-Explainer:	[What made you choose that?] ---> Causal antecedent question
-Explainee:	['Like any freshman,', 'going into chemical engineering,', 'I was like, I like chemistry!', "So I'm gonna go into chemical engineering.", 'But luckily I also like', 'all the math and all the science too.']

Example (2):

-Explainer:	["You're a string theorist, so tell us what kind", 'of string theory you do, what it means', 'to be a string theorist.']
-Explainee:	["One of the things that's key", 'in the whole story of string theory', 'is the piece of it that talks about', 'quantum theories of gravity.', "So I'm very excited about what happens to spacetime,", 'what does it even mean at the quantum level.']
-Explainer:	['Cool, so do you think a lot about extra dimensions', 'in your everyday life?']
-Explainee:	['Uh, yes I do.']
-Explainer:	['And so when you think about extra dimensions,', 'you put them together with brains and different fields', 'wrapping around the extra dimensions and so forth, right?']
-Explainee:	['Yes.']
-Explainer:	['You know, a lot of people, a lot of string theorists,', 'they care a lot about all the different ways', 'in which we could hide the extra dimensions.', 'As  -Explainee:	["Yes, well ultimately we'd like to understand", 'the observable universe.', 'If string theory turns out to be the thing', 'that the universe cares about,', "we'd like to know, with all of these possibilities", 'that are in string theory, how do we get the one', 'that looks like the world we live in?']