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 pitutiary 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.
Diabetes insipidus leads to excessive urination and leads to excessive thirst. It involves a deficiency of vasopressin also known as antidiuretic hormone (ADH) which leads to reduced absorption in collecting tubule. It is produced by the posterior pituitary. Both the statement is correct but reason is not suitable for the given assertion.
So, the correct answer is option B.

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