This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
What is a Rhinolith: 
Select and explain. 
A. Foreign body in nose, B. Stone in nose, C. Deposition of calcium around foreign body in nose, D. Misnomer
C: Deposition of calcium around foreign body in nose
Answer: C: Deposition of calcium around foreign body in nose 
Explanation: Rhinoliths are calcareous masses which result due to deposition of salts-like calcium and magnesium carbonates and phosphates around the nucleus of a foreign body. Ref Dhingra 6/e,p 161.