Zona hatching occurs:: (A) 4 days after feilisation, (B) 5 days after feilisation, (C) 6 days after feilisation, (D) 8 days after feilisation
Answer is B. Zona hatching occurs just before the implantation i.e,5 days after feilisation. Ref: Datta textbook of Obstetrics - 9e pg24.