Discussion
Assertion (A) : Goitre is a common disease in mountainous regions.
Reason (R) : The diet of the people in mountains lacks iodine content.
Answer: A
Correct answer: Both A and R are true and R is the correct explanation of A.
Iodine is washed out of hill soils by rain and carried down to the plains, so mountain diets are short of it. Without iodine the thyroid cannot make its hormones and enlarges - which is goitre. The dietary lack is exactly the cause. Both are true and R explains A.
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