After an infection or injury to the lung, what can happen?\nOptions:\n- (A) Destroy crops\n- (B) a lot of human deaths\n- (C) Plant growth is reduced\n- (D) destroying life\n- (E) forest is destroyed\n- (F) opportunistic infections\n- (G) death and devastation\n- (H) negative impact Let's solve this problem gradually.

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Pneumonia may be caused by an infection or injury of the lungs. Opportunistic infections, such as Pneumocystis carinii pneumonia, begin to occur. Opportunistic infections may be a result of an infection or injury of the lungs. So the final answer is (F).
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