Assertion (A): Drinking of whisky increases the frequency of urination. Reason (R): Alcohol intake speeds up the secretion of vasopressin in the body.

Correct Option (C):

Assertion (A) states that drinking whisky increases the frequency of urination. This statement is true. Alcohol, including whisky, functions as a diuretic. It achieves this by inhibiting the secretion of vasopressin, also known as antidiuretic hormone (ADH), from the posterior pituitary gland. Vasopressin is crucial for promoting water reabsorption in the renal tubules of the kidneys. When its secretion is suppressed by alcohol, less water is reabsorbed into the bloodstream, leading to an increased volume of urine production and, consequently, a higher frequency of urination.

Reason (R) states that alcohol intake speeds up the secretion of vasopressin in the body. This statement is false. Alcohol does not accelerate vasopressin secretion; instead, it actively suppresses or inhibits its release. The diuretic effect observed after alcohol consumption is a direct result of this inhibition of vasopressin, not an increase.

Therefore, Assertion (A) is true, but Reason (R) is false.

Incorrect Options:

Option 1 is incorrect because Reason (R) is false.

Option 2 is incorrect because Reason (R) is false.

Option 4 is incorrect because Assertion (A) is true, not false, and Reason (R) is false, not true.