This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Physiology
Which hormone stimulates respiration? 
Select and explain. 
A. Estogon, B. Progesterone, C. Coicosteroids, D. Prolactine
B: Progesterone
Answer: B: Progesterone 
Explanation: Progesterone a steroid sex hormone that is the principal progestational agent; it plays a major pa in the menstrual cycle. During the maturation of the secondary oocyte (ovum), estrogen, the principal female sex hormone, is produced at a high rate.Ref: Ganong&;s review of medical physiology, 23ed edition, page no: 418