A Number of Students Often Develop Colds and Other Minor

A number of students often develop colds and other minor illnesses during final exam week.Based on the research into the physical responses to stress, this may happen because the stress of final exams:

A) raises the level of lymphocytes in the students' blood
B) lowers the level of cortisol in the students' blood
C) raises the level of cholesterol in the students' blood
D) lowers the level of lymphocytes in the students' blood

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