问题
单项选择题
A 9-month-old, well-nourished boy who lives with his extensive extended family tests positive for tuberculosis. Which of the following is a risk factor for tuberculosis in this client
A．Male sex.
B．The infant is in the 95th percentile for height and weight.
C．His mother did not receive prenatal care until the second trimester of her pregnancy.
D．Age.
答案
参考答案：D
解析：Infants are more susceptible to tuberculosis because of a diminished resistance to infection due to an immature immune system.