This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Medicine
Which of the following cast is normal in urine 
Select and explain. 
A. Granular, B. Waxy, C. Epithelial, D. Hyaline
D: Hyaline
Answer: D: Hyaline 
Explanation: Hyaline casts are both the most diffi- cult to visualize and least impoant type of casts encountered in the urine sediment. They are the result of solidifica- tion of Tamm-Horsfall mucoprotein, which is secreted by the renal tubular cells, and they may be present without significant proteinuria. Ref Harrison20th edition pg 277