Which of the following statements is not correct?

• A
  The brown adipose tissue cell has a single large droplet surrounded by a small amount of cytoplasm,whereas the white adipose tissue cell has many small droplets of fat suspended in a larger amount of cytoplasm.
• B
  Brown fat cells contain many mitochondria,while white fat cells have comparatively few.
• C
  Brown fat has a larger capacity for generating heat than white fat.
• D
  Brown fat is mainly found in newborn mammals.