<prompt> True about timing of LH surge :Occur 12 hour before ovulationOccur 24 hour before ovulationOccur 12 hour after ovulationOccur 24 hour after ovulation  <response>: LH surge initiates luteinization acting through its receptors about 24-48 hours prior to ovulation. Ref: D.C. Duttas Textbook of Gynaecology, 6th edition, page no: 92 