Review Question - QID 213798

A 35-year-old woman presents to her primary care provider reporting intermittent pain in her left side that is worse with urination. She states that she has also been urinating more frequently and is waking up at night to urinate. She was previously healthy, although she has had two episodes of urinary tract infections that resolved with antibiotics. Her temperature is 98.4°F (36.9°C), blood pressure is 110/78 mmHg, pulse is 65/min, and respirations are 12/min. The patient does not have any tenderness on exam, and genitourinary exam is grossly normal. A urinalysis is performed, demonstrating a urine pH of 8.0, negative leukocyte esterase, and negative bacteria. Large quantities of crystals are seen, as shown in Figure A. Which of the following is the likely composition of these crystals?