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Intoxicating drugs of plant origin and certain chemicals may permanently damage which body systems?
ASkeletal system and tooth enamel only
BSkin pigment and hair follicles only
CNervous system, muscle system and heart
DOuter ear and the sense of smell only
Answer & Solution
Correct answer: C. Nervous system, muscle system and heart
1. The text states such drugs may permanently damage the human nervous system, muscle system and heart.
2. Option C names exactly these three.
3. The skeletal/tooth-enamel option is wrong because bone damage is not the cited effect.
4. Skin pigment and outer-ear options list parts not mentioned for permanent drug damage.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 9 "Social Health", p.111_
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