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: Physiology
Stimulus for prolactin release is ? 
Select and explain. 
A. Dopamine, B. Hyperglycemia, C. Sleep, D. Nipple stimulation
D: Nipple stimulation
Answer: D: Nipple stimulation 
Explanation: Ans. is'd'i.e., Nipple stimulation[Ref: Human physiology p.383)Prolactin is the only pituitary hormone which is primarily under inhibitory control of hypothalamus .Its secretion is suppressed by dopamine (Prolactin inhibitory substance) secreted by hypothalamus.