Answer:
-Skin.
Step-by-step explanation:
Melanoma can be defined as a type of skin cancer, which develops in pigment cells or melanocytes.
The main cause for melanoma is exposure to sun that leads to DNA damage and development of cancerous cells. People having more than fifty moles have higher chances of having melanoma as moles can transformed into malignant tumors.
Thus, the correct answer is 'skin.'