1- largest organ in human body

1- which of the following is the largest organ in the human body?

a- liver
b- skin
c- spleen
d- brain

---- answer is b .obviously the answer has to be skin , otherwise y wud i post this question under dermatology . the skin forms approximately 8% of the total body mass . the surface area of the skin in a man weighing 90 kg and with a height of 1.8 m is 2.2 square meters . when we talk about the thickness of the skin it varies depending on the maturation , ageing and regional specifications but generally an average of 1.5 to 4 mm is accepted . gotta accept the values as they are given in GRAY'S ANATOMY 39 TH EDITION - PAGE 157 .