This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
[{'content': 'All of the following use c-AMP as a second messenger except \nSelect and explain. \nA. Coicotropin, B. Dopamine, C. Testosterone, D. Vasopressin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Testosterone - the principal male sex hormone (androgen) is a steroid hormone that is produced by Leydig&;s cells of the testes in response to luteinizing hormone secreted by the pituitary gland. It is also produced by the adrenal coex in both males and females.Ref: Ganong&;s review of medical physiology; 24th edition: page no: 423', 'role': 'assistant'}]