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
[{'content': 'The main source of production of relaxin is \nSelect and explain. \nA. Ovary, B. Placenta, C. Decidua, D. Adrenals', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]