Drinking whiskey, or any alcoholic beverages, does indeed increase the frequency of urination. This occurs because alcohol inhibits the production of the hormone vasopressin, which regulates the body`s water retention. Therefore, (A) is true.

However, the provided reason (R) is incorrect. It states that alcohol intake speeds up the secretion of vasopressin, which contradicts the actual effect of alcohol on this hormone. Alcohol decreases, not increases, the secretion of vasopressin. So, (R) is false.

So, going through the options:

Option 1 is incorrect as R is not the correct explanation of A.

Option 2 is incorrect as R is false.

Option 3 is correct as A is true and R is false.

Option 4 is incorrect as A is true, not false.

Hence, the correct answer is 3: A is true but R is false.