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: Anatomy
BMP -4 is inhibited by A/E 
Select and explain. 
A. Noggin, B. Follistatin, C. Retinoic Acid, D. Chordin
C: Retinoic Acid
Answer: C: Retinoic Acid 
Explanation: C i.e. Retinoic Acid