Assertion : XX-XY type of sex determination mechanism is an example of male heterogametry. Reason : In birds, male heterogamety is seen as males produce two different types of gametes.

• A. If both assertion and reason are true and reason is the correct explanation of assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of assertion.
• C. If assertion is true but reason is false.
• D. If both assertion and reason are false.