Choose the correct alternative from the following :
Assertion (A) : Goitre is a common disease in mountainous regions.
Reason (R) : The diet of the people in mountains lacks iodine content.
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.
C. A is true but R is false.
D. A is false but R is true.
E. Both A and R are false
Answer: A . Both A and R are true and R is the correct explanation of A.
Goitre is commonly caused in mountainous regions because goitre is caused by deficiency of iodine and diet in mountainous areas lacks iodine.