Answer :
Opportunistic pathogens are microbes that are part of the normal biota of a human body, but can cause infection when the body’s normal defenses are weakened or impaired. So the correct option is d.
One example of an opportunistic pathogen is Candida albicans, a type of yeast commonly found in the body. It is usually kept in check by the body’s normal flora and does not cause infection when it stays within its normal habitat. However, in people with weakened immune systems, it can cause a wide range of infections such as thrush, vaginitis, and urinary tract infections.
Another example of an opportunistic pathogen is Staphylococcus aureus, a type of bacteria commonly found on the skin and in the nose. It is usually harmless, but can cause serious infections in people with weakened immune systems, such as sepsis or endocarditis.
Finally, Streptococcus pneumoniae is an example of an opportunistic pathogen. It is a type of bacteria commonly found in the respiratory tract, and usually does not cause infection in healthy individuals. However, it can cause infections such as pneumonia, meningitis and sinusitis in those with weakened immune systems.
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a.Candida albicans
b.Staphylococcus aureus
c.Streptococcus pneumoniae
d.All the above