Which are correct: A. Computed tomography and magnetic resonance imaging detect cancers of internal organs. B. Chemotherapeutics drugs are used to kill non-cancerous cells. C. α-interferon activate the cancer patients’ immune system and helps in destroying the tumour. D. Chemotherapeutic drugs are biological response modifiers. E. In the case of leukemia blood cell counts are decreases. Choose the correct answer from the options given below:

Solution & Explanation

Answer: (B) A and C only. Solution: CT and MRI are used to detect cancers of the internal organs, so A is correct. α-interferon is a biological response modifier that activates the cancer patient's immune system and helps destroy the tumour, so C is correct. Why not the others: B is wrong — chemotherapeutic drugs kill CANCEROUS cells, not non-cancerous ones. D is wrong — α-interferon (not chemotherapeutic drugs) is the biological response modifier. E is wrong — in leukemia blood cell counts INCREASE, which is why blood/bone-marrow tests check for increased cell counts. Only A and C are correct. NCERT Reference: NCERT Ch7, p.141-142, p.142 lines 19-21: "biological response modifiers such as α-interferon which activates their"