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:'.

[Q]: 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?
[A]: The thin fat layers are impermeable, so water steam gets trapped and exercise pressure upwards, lifting the pastry up

[Q]: CONTEXT: Yes, nuts are very fatty, and they will eventually go rancid if this is the case, they will taste very poor. They can also dry out, or in more rare cases (especially if stored improperly) be infested with insects or molds.Generally, they should be good for six months to a year at their best flavor, depending on the variety (in the shell).Five years is a little long. I am not sure I would want to eat nuts that old. <sep> Q: Do nuts ever go bad? A: es, nuts are very fatty, and they will eventually go rancid <sep> FOLLOWUP_Q: What causes them to go rancid?
[A]: They can also dry out, or in more rare cases (especially if stored improperly) be infested with insects or molds

[Q]: CONTEXT: The reason it tastes sweet is the presence of sugar, ie because it is sweet. Cinnamon is thin tree bark, and it is not uncommon for tree bark, or the layer near the bark to be sweet because of sap. Birch is another example of a tree that is sweet, you can suck on a peeled birch branch for the same reasons as stated in your question. <sep> Q: Why do cinnamon sticks taste sweet? A: The reason it tastes sweet is the presence of sugar, ie because it is sweet <sep> FOLLOWUP_Q: What do you mean tree bark?
[A]:
n tree bark