question_answer

Assertion (A) : The phenomenon where tumour cells detach and migrate to other parts of the body where they give rise to secondary tumours is called metastasis. Reason (R): Abnormal antigens on the surface of cell and unusual member of chromosomes cause metastasis. The correct answer is

A)  Both (A) and (R) are true and (R) explains

B)  Both (A) and (R) are true but (R) cannot explain

C)  Only (A) is correct but not (R)

D)  Both (A) and (R) are wrong