<prompt> Answer this question truthfullyCould you provide a specific phrasing that you would like me to rephrase it in? The original sentence already appears to be proper English.  <response>: <reason> Ovarian hyperstimulation syndrome is usually iatrogenic secondary to ovarian stimulant drug therapy for infertility but may occur as a spontaneous event in pregnancy.Cetrorelix Choriogonadotropin alfa Follitropin beta Urofollitropin 