Individuals with HIV sometimes contract pneumonia infections that are rare in the rest of the population because people with HIV:
a. are unable to fight off these pneumonia- causing organisms
b. are more often exposed to these pneumonia- causing organisms
c. release pheromones that attract the pneumonia- causing organism
d. release substances that increase the strength of the pneumonia- causing organisms
Answer: a. are unable to fight off these pneumonia- causing organisms