Given a paragraph about cooking, and a set of conversational question answers about the paragraph, generate a relevant question to the topic of the paragraph. The paragraph has the prefix 'CONTEXT:'. Each conversation question has a prefix 'Q:' followed by the answer prefix 'A:'.

Let me give you an example: CONTEXT: Milk won't help you - it's mostly water, and gluten develops from flour (more accurately, specific proteins in flour) and water.The way to reduce gluten development is to incorporate more fat into the batter. Lipids are hydrophobic and will prevent further hydration of the glutenin.Using a lower-protein flour will also help. If you're not already using cake flour, the reason it's called cake flour is because of the lower protein content.That being said, have you actually tried leaving the batter coarse? Just because the batter is lumpy does not mean that the cake will have big lumps. The entire mixture is wet, so unless you leave huge lumps of dry flour in the batter, you won't end up with a lumpy cake. There's a difference between don't overmix and don't mix - you're supposed to mix enough to incorporate, just don't try homogenize it. <sep> Q: How can I avoid lumps in the cake? A: have you actually tried leaving the batter coarse? Just because the batter is lumpy does not mean that the cake will have big lumps Q: No, I haven't. I'll try that next. Is it safe to add more milk into the batter? A: Milk won't help you - it's mostly water, and gluten develops from flour (more accurately, specific proteins in flour) and water.
The answer to this example can be: What can I add to make it more softer and avoid hardening?
Here is why: This conversation is about the process of preparing cakes and how lumps can be avoided in it. The question asked is relevant as it is on the same topic and it asks how to avoid hardening of cake. This is also a followup question of the last conversational question and answer about adding more milk into the cake batter.

OK. solve this:
CONTEXT: You cooked it at too low a temperature. Sous vide is intended for meat where you want the protein to remain tender. It shouldn't have any sinews. Think chicken breasts, or the long filet along the spine of a pig. This meat gets nicely cooked at 60-65C (depends on the animal), and tough and dry above that. Meat marbled with sinews has to be cooked at a temperature where the sinews (collagen) melt into gelatin. This happens at about 70C at least, and takes hours. Since the muscle fibres are already toughened at that temperature, there is no reason to hold it low; you can put it at full boil in a normal pot and cook it there, you just have to wait long enough. In theory, you could do it in a sous vide bath too, but you won't get any of the benefits sous vide gives to tender meat. <sep> Q: I tried cooking sous vide chicken and it came out tough and stringy, can you tell me why? A: Sous vide is intended for meat where you want the protein to remain tender. It shouldn't have any sinews Q: I tried cooking it at 60C, is that the correct temperature? A: This meat gets nicely cooked at 60-65C (depends on the animal), and tough and dry above that
Answer:
How long should I cook chicken breasts at that temperature?