system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which of the following statements about twinning Is true?
assistant
The correct answer is  Dizygotic twins arise from feilization of two Ova by different spermatozoa.Each twin has its own placenta,chorion and amnion. Monozygotic twins always result from splitting of a single feilised ovum and hence always of the same sex and look alike (refer pgno:178 sheila textbook of obstetrics 2 nd edition)