AIIMS PG Exam – 84936 Leave a Comment / AIIMS PG Exam / By Renu Maurya Question Vasodilatation is caused by: A. Serotonin B. Histamine C. LT C4 D. Thromboxane A2 Show Answer Correct Answer » B Explanation Ans. B. Histamine * Histamine causes marked dilatation of smaller blood vessels that include arterioles, capillaries, and venules. Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Like this:Like Loading…