Assertion :Diabetes insipidus is marked by excessive urination and too much thirst for water.
Reason: Anti-diuretic hormone (ADH) is secreted by the posterior lobe of pituitary gland.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Antidiuretic hormone (ADH) or vasopressin is secreted from posterior pituitary gland. It is released in response to a fall in the water content of blood plasma and lead to an increase in the permeability to water of the distal and collecting tubules of the nephron. Deficiency or hypo secretion of ADH results in diabetes insipidus. Diabetes insipidus is characterised by micturating dilute urine several times a day which results in excessive
thirst (polydipsia) and dehydration. So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.

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