Human Health And Disease Question 97
Question: Read the assertion and reason carefully to mark the correct option out of the options given below:
Assertion : HIV causes cellular immunodeficiency.
Reason : HIV kills helper T -lymphocytes but does not directly kill B -lymphocytes.
Options:
A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
Show Answer
Answer:
Correct Answer: C
Solution:
Assertion: The assertion is true. HIV does cause cellular immunodeficiency⁵⁷⁸. It does this by destroying CD4+ T cells (also known as helper T cells), which are crucial for coordinating the immune response⁵⁷⁸.
Reason: The reason is also true, but it’s not a complete explanation of the assertion. While it’s true that HIV kills helper T cells²³⁴, it doesn’t directly kill B cells. Instead, the loss of helper T cells disrupts the function of B cells, among other immune cells¹²³⁴. So, while HIV does have an effect on B cells, it’s not by directly killing them. Therefore, the reason is true, but it’s not a correct explanation of the assertion. Hence, the correct answer is B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion..
BETA
