Answer:
The correct answer is: the extensive regeneration in parenchymal organs can only occur if the residual tissue is structurally and functionally intact.
Step-by-step explanation:
The only parenchymal organ that can have proper regeneration is the liver. In other organs, regeneration is limited and can only happen with stable cell populations. For these organs to regenerate, the residual tissue MUST BE structurally and functionally intact; if it isn't, it will be replaced with scar tissue.