矿井每（）天进行1次全面测风，测风地点、位置、测风周期必须符合有关规定。

A young adult had a significant reaction to the Mantoux test. What conclusion would the nurse make from the findings

A．The client has active tuberculosis.

B．The client had active tuberculosis.

C．The client has been exposed to tuberculosis.

D．The client is immunocompromised.