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Question 23M.1.HL.TZ2.34

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.1.HL.TZ2.34
Level HL Paper 1 Time zone TZ2
Command term Question number 34 Adapted from N/A
34.
[Maximum mark: 1]
23M.1.HL.TZ2.34

What can occur as a result of exposure to an allergen such as pollen?

A.  T lymphocytes produce antibodies.

B.  Memory cells release antihistamine.

C.  The allergen acts directly on the blood vessels, causing vasodilation.

D.  White blood cells release histamine.

[1]

Markscheme

D