What does a female contraceptive by the name of Mala-D do?

Options :
  1. It prevents ovulation.
  2. It prevents fertilisation.
  3. It prevents entry of the egg into the oviduct.
  4. It prevents implantation of the fertilised egg.
Answer and Explanation :-

Answer: Option 1

Explanation:

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Prime numbers are what is left when you have taken all the patterns away. I think prime numbers are like life. They are very logical but you could never work out the rules, even if you spent all your time thinking about them.
-Mark Haddon The Curious Incident of the Dog in the Night-Time