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:'.

CONTEXT: In the US, I normally see them marketed as "heirloom" tomatoes; I don't know if there are specific regulations in the UK or Finland that might have restrictions on the term's use. (like there now is in the US with "organic" )Because they weren't developed for industrialized farming, they didn't focus on breeding in traits that were desired for mass production -- size, round shape, bright color, shelf life, durability in transport.As such, there's a much wider variety, and they tend to be locally grown on small farms (as they don't tend to transport well, or be suitable for mechanized production). They might've been bred for sweetness, tartness, number of fruit per plant, disease resistance, etc, so you can't say that heirlooms necessarily taste better; a locally grown, picked that day non-heirloom tomato might taste just as good.To make this clear -- very few vegetables are produced in a truly 'uncontrolled' environment (maybe 'less controlled' environment)-- humans have been selecting for specific traits for centuries; it's just that the processes used were much less high-tech back then -- you saved the seeds from plants that produced what you liked, it's possible that some might've even been hand-pollinated to cross breed cultivars.) <sep> Q: What makes a tomato "heirloom"? A: They might've been bred for sweetness, tartness, number of fruit per plant, disease resistance <sep> FOLLOWUP_Q: What is the difference between heirloom and conventional tomatoes?
they weren't developed for industrialized farming, they didn't focus on breeding in traits that were desired for mass production