Responsible friends would never engage you in risky behaviours, especially in sexual ones. Responsible friends are most likely not to do this kind of things, but you also have to be responsible.
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Answer:
42
Explanation:
PTP is Post transfusion Purpura which is a delayed adverse reaction to blood or platelet transfusion. The human body has alloantibodies which resists any new intake of blood. The immune system need to be slow down and these antibodies are paused when performing any surgery or when platelets infusion takes place.