Assertion: AIDS leads to a progressive decrease in number of helper T-lymphocytes in the infected person. Reason: HIV virus replicates and produces progeny virus in helper T-lymphocytes which are released in blood. (1) Assertion and Reason are true and Reason is correct explanation of Assertion (2) Assertion and Reason are true, but Reason is not the correct explanation of Assertion (3) Assertion is true, but Reason is false (4) Assertion is false, but Reason is true