Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).
Assertion: MTT assay is used to determine cell viability based on the principle of color formation by DNA fragmentation.
Reason: MTT assay is used to determine cell viability based on the color development by converting tetrazolium soluble sail to insoluble salt.

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 true but (R) is false

D. (A) is false but (R) is true

Answer: Option A