$A$ : Bt toxin are protein crystals containing insecticidal protein
$R$ : B. thuringiensis forms these protein crystals throughout continuously during their growth period.

• A

  Assertion and Reason both are correct and also correct explanation.

• B

  Assertion and Reason both are correct but not explanation of assertion.

• C

  Assertion is correct, but Reason is incorrect.

• D

  Both Assertion and Reason are incorrect.