This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Urinary Tract), Subject name: Pathology
Stone seen in urinary tract infection is - 
Select and explain. 
A. Calcium oxalate, B. Uric acid stones, C. Staghorn calculus, D. Cysteine stones
C: Staghorn calculus
Answer: C: Staghorn calculus 
Explanation: Ans. is 'c' i.e., Staghorn calculus Urolithiasiso Calcium Oxalate stones - associated with hypercalcemia and hypercaleiuriao Staghorn Calculi - Large Magnesium ammonium phosphate stones formed in patients with infection of urine splitting organisms (Proteus and some staphylococci) followed by precipitation in alkaline urine,o Uric acid stones - Patients with hyperuricemiao Cystine stones - Genetic defect in renal reabsorption of cytine leading to cystinuria.