Assertion : ZSM ? 5 is used as a catalyst in petrochemical industries. Reason : Zeolites are three dimensional network silicates in which some silicon atoms are replaced by aluminium atoms.

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