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Read the following statements and select the correct answer.
I. Psychoactive drugs have the ability to alter the activity of the nervous system.
II. Addiction is a psychological attachment to certain effects such as euphoria and temporary feeling of well-being associated with drugs and alcohol.
III. When the drugs are taken for a purpose other than medicinal use or in amounts/frequency that impairs one's physical, physiological or psychological functions, it constitutes drug abuse.
IV. Smoking increases carbon monoxide content in blood and reduces the concentration of oxygen. This causes oxygen deficiency in the body.
(a) I and II
(b) III and IV
(c) I, II and IV
(d) I, II, III and IV

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