Which of the following is a malignant neoplasm of epithelial tissue related to skin?

Basal Cell Carcinoma is indeed a malignant neoplasm of epithelial tissue specifically associated with the skin. This type of cancer arises from the basal cells, which are found in the lowest layer of the epidermis. It is the most common form of skin cancer and often occurs in areas that are frequently exposed to sunlight. Basal Cell Carcinoma typically presents as a pearly bump on the skin or a red patch, and while it is generally slow-growing and has a high cure rate when detected early, it is classified as malignant due to its potential to invade surrounding tissues.

The other options represent different types of malignant tumors that arise from other tissue types. Osteosarcoma is a malignant bone tumor, chondrosarcoma originates from cartilage, and liposarcoma arises from adipose (fat) tissue. Each of these tumors is not related to epithelial tissue or skin specifically, making Basal Cell Carcinoma the correct answer in this context.