Teacher: Given a paragraph about cooking, and a set of conversational question answers about the paragraph, answer a follow-up question from the paragraph. The paragraph has a prefix 'CONTEXT:'. Each conversation question has a prefix 'Q:' followed by answer prefix 'A:'. The final followup question has a prefix 'FOLLOWUP_Q:'.
Teacher: Now, understand the problem? If you are still confused, see the following example:
CONTEXT: What I've done in the past is mist some water on both sides of the bread slices, then put them in the microwave for 10-15 seconds (alternatively, an oven set at 300F/150C for 5-10 minutes will do it too).Experiment with the amount of water (but keep it low) and cooking times. You should get much softer (and warm) bread slices out of it.  <sep>  Q: How do I make whole multi grain bread softer? A: mist some water on both sides of the bread slices  <sep> FOLLOWUP_Q: Does that make it soggy?
Solution: Experiment with the amount of water (but keep it low)
Reason: Here the follow-up question asks about a way to make the bread softer. The answer (Experiment with the amount of water) is mentioned in the passage.

Now, solve this instance: CONTEXT: Flour (+ water, either directly or from other ingredients such as egg white) gives the pastry structure. As you knead the flour, the gluten network develops and results in elasticity. When cooked, water evaporates from the dough leaving a rigid gluten skeleton. Fat does not mix with water and thus stay in blobs in between the gluten network. This weakens the gluten structure, making the pastry crumble.For this reason, you often see in recipes for shortcrust to avoid overmixing the fat. Buttery biscuits such as shortbread crumble more than crackers, which have more water. The same rationale applies to puff pastry. The thin fat layers are impermeable, so water steam gets trapped and exercise pressure upwards, lifting the pastry up.Quoting @GdD in the comments, the punchline is:more fat = crumblier, less fat has more structure.  <sep>  Q: How does altering the fat-to-flour ratio affect the pastry? A: more fat = crumblier, less fat has more structure  <sep> FOLLOWUP_Q: Is it only crumblier after it bakes?
Student:
The thin fat layers are impermeable, so water steam gets trapped and exercise pressure upwards, lifting the pastry up