Final answer:
A person does not become less resistant to a pathogen by being born with specific immune responses, as such responses are developed through exposure to pathogens over time, and not present at birth.
Step-by-step explanation:
The question pertains to what does not make a person less resistant to a pathogen. Factors that strengthen or maintain resistance to pathogens include a robust and functional immune system, which comprises both innate and acquired immune responses. The innate immune response acts quickly to combat pathogens. In contrast, the acquired immune response develops antibodies after exposure to a specific pathogen, which can then be rapidly recalled upon subsequent infections. A healthy microbiome also plays a critical role in immunity by inhibiting pathogen growth and contributing to a stronger overall defense against infectious diseases. However, the scenario (a) where a person is born with specific immune responses against any pathogen does not contribute to resistance because immune responses are developed after exposure, not at birth.