Final answer:
The only controllable risk factor of infectious diseases among the given options is drug abuse.
Step-by-step explanation:
Controllable Risk Factors of Infectious Diseases:
A controllable risk factor refers to factors that can be managed or modified to reduce the risk of contracting infectious diseases. From the given options, the only controllable risk factor is drug abuse. Drug abuse can weaken the immune system, making individuals more susceptible to infections. For example, injection drug use increases the risk of HIV and hepatitis C transmission.
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