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: Pharmacology
Fexofenadine is metabolic product of : 
Select and explain. 
A. Loratidine, B. Astemizole, C. Cetrizine, D. Terfenadine
D: Terfenadine
Answer: D: Terfenadine 
Explanation: None