Determine the correctness or otherwise of the following Assertion (a) and the Reason (r) Assertion : Cytoplasmic male sterility (cms) is invariably due to defect(s) in mitochondrial function. Reason : cms can be overcome by pollinating a fertility restoring (Rf) plant with pollen from a non cms plant.

• A. both (a) and (r) are true and (r) is the correct reason for (a)
• B. both (a) and (r) are true and (r) is not the correct reason for (a)
• C. (a) is false but (r) is true
• D. (a) is true but (r) is false