What condition pertains to the formation of stones in the body?

The term that pertains to the formation of stones in the body is "lithiasis." This medical term is derived from the Greek word "lithos," meaning stone, and it is used to describe the process of stone formation in various organs, particularly in the kidneys (nephrolithiasis), gallbladder (cholelithiasis), or urinary tract (urinary lithiasis). The formation of these stones can occur due to various factors, including changes in concentration of certain minerals or substances in body fluids, which can lead to crystallization and subsequent stone formation.

In contrast, the other terms represent different medical conditions. Lymphadenopathy refers to the enlargement of lymph nodes, often due to infection or disease. Hemorrhage indicates bleeding, which can occur internally or externally and is not related to stone formation. Leukemia is a type of cancer that affects the blood and bone marrow, characterized by the overproduction of abnormal white blood cells. These conditions do not involve the formation of stones in the body, making lithiasis the specific and correct term for that phenomenon.