A) Melatonin
B) Histamine
C) Sebum
D) Threonine
Correct Answer: B
Solution :
Allergy is the vigorous immune response to substances known as allergens like pollens, dust, etc. In response to allergens, antibodies of IgE class activates and triggers immune reaction by releasing large amounts of histamine and serotonin in blood. Histamine is normal initiator of inflammatory response and cause dilation of arteries, increased capillary permeability, etc.
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