This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Preferred method for determining microalbuminuria is: 
Select and explain. 
A. Urinary dipsticks, B. 24 hour urinary protein collection, C. Urinary A/C Ratio in a spot voided sample, D. Urinary A/C Ratio in a 24 hour collection
C: Urinary A/C Ratio in a spot voided sample
Answer: C: Urinary A/C Ratio in a spot voided sample 
Explanation: Answer is C (Urinary A/C Ratio in a spot voided sample) The preferred method to establish microalbuminuria is to determine Albuma / Creatinine Ratio (A/C Ratio) in a spot voided urine sample. `The presence of albumin in the urine in the range of microalbuminuria is best determined by a urinary A /C Ratio in a spot voided sample. The A/C ratio correlates closely with 24 hour urine albumin estimation and this measure has the advantage of avoiding in accuracies in urine collection and the unpleasentness of having to store urine during the collection process'- Hypeension Primer' 4th/384