Which of the following statements are correct? (i) Abstinence from drugs of dependence causes withdrawal symptoms but not craving. (ii) Chikungunya is confirmed by Widal test. (iii) Rheumatoid arthritis, which affects many people in our society, is an auto-immune disease. (iv) AIDS was first reported in 1981 and is caused by a member of a group of viruses called retroviruses. (v) Benign tumors are normally considered with metastasis. (vi) Most powerful stimulant is cocaine.

• A. (i), (ii) and (v)
• B.                    (i), (iii), (iv) and (vi)
• C. (iii), (v) and (vi)
• D.                    (iii), (iv) and (i)