The answer to your first question is D. Three months. The reason why is it takes at least 3 months to have detectible HIV antibodies. In rare cases, it may take up to 6-12 months.
The second question I'm not 100% positive on but I believe the answer would be B.
Hypnosis can be used to help gain control over undesired behaviors or to help you cope better with anxiety or pain.
Respiratory syncytial virus, whooping cough, pneumonia