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
Which of the following is preferred in treating opioid induced constipation 
Select and explain. 
A. Linaclotide, B. Lubipristone, C. Alvimopan, D. Prucalopride
C: Alvimopan
Answer: C: Alvimopan 
Explanation: Alvimopan is a peripheral opioid antagonist used against opioid induced constipation.