The correct option is C Renal Calculi
Kidney stones, are also termed as renal calculi. The size of these kidney stones may range from the size of a sugar crystal to a ping pong ball and are usually found on the inner lining of the kidneys. It is one of the most painful medical conditions. Based on the hard deposits, there are different types of kidney stones, and they vary according to the type of stone, including: Calcium, Uric acid, Struvite and Cystine.