Which of the following type 1 hypersensitivity causes redness of eyes?

Which of the following type 1 hypersensitivity causes redness of eyes? Correct Answer Allergic conjunctivitis

Conjunctivitis is a very common cause for an uncomfortable, red eye. There are a number of causes for conjunctivitis, which include bacteria, viruses and, importantly, allergies. Allergic conjunctivitis affects the conjunctiva of the eye. The conjunctiva refers to the thin, mucous membrane that extends from the limbus of the eye over the anterior surface of the eyeball and then continues over to cover the posterior surface of the eyelids. It occurs if there has been any recent exposure to other people with conjunctivitis or an upper respiratory tract infection. This may be a sign of viral conjunctivitis and is seen more commonly. 
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Related Questions

Statement 1: Elizabeth has four children.
Statement 2: Two of the children have blue eyes and two of the children have brown eyes.
Statement 3: Half of the children are girls.
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b. Two of the children are boys.
c. The boys have brown eyes.
Fact 1: Jessica has four children
Fact 2: Two of the children have blue eyes and two of the children have brown eyes.
Fact 3: Half of the children are girls.

If the first three statements are facts, which of the following statements must also be a fact?
I: At least one girl has blue eyes.
II: Two of the children are boys.
III: The boys have brown eyes.
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