This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Pathology, Subject name: Pathology
So the following heme degradation products in order of production: a. Protoporphyrin b. Urobillinogen c. Bilirubin d. Biliverdin 
Select and explain. 
A. a,c,d,b, B. b,d,c,a, C. a,d,c,b, D. b,c,d,a
C: a,d,c,b
Answer: C: a,d,c,b 
Explanation: None