Assertion (A): True xerophytes store water in the form of mucilage which helps to withstand prolonged period of drought.Reason (R): Vascular and mechanical tissues are well developed in true xerophytes.The correct answer is ?

• A. Both A and R are true, but R is not the correct explanation of A
• B. Both A and R are true and R is the correct explanation of A
• C. A is false, but R is true
• D. A is true, but R is false