This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
The main source of production of relaxin is 
Select and explain. 
A. Ovary, B. Placenta, C. Decidua, D. Adrenals
A: Ovary
Answer: A: Ovary 
Explanation: The main source of production of relaxin is the corpus luteum of the ovary but pa of it may also be produced by the placenta and decidua. Ref: KD Tripathi 8th ed.