Assertion : Protandry and protogyny ensure cross fertilisation in some animals. 
Reason : Cross fertilisation introduces variation in progeny. 
 

• A

  Both assertion and reason are true and reason is the correct explanation of assertion

• B

  Both assertion and reason are true but reason is not the correct explanation of assertion

• C

  Assertion is true but reason is false

• D

  Both assertion and reason are false