Assertion (A) : Goitre is a common disease in mountainous regions.
Reason (R) : Diet of the people in mountains lacks iodine content.
Which one of the following is the correct answer?
(a)Both (A) and (R) are true and (R) is the correct explanation of (A).
(b)Both (A) and (R) are true but (R) is not the correct explanation of (A).