Through which pathways do infections spread in the human body?

Correct option is C

Infections spread within the body through multiple pathways, mainly via the bloodstream (hematogenous spread) and the lymphatic system. Pathogens like bacteria or viruses can enter the bloodstream and reach distant organs. Similarly, lymphatic channels transport infected lymph from one node to another, potentially causing systemic involvement. Both routes play major roles in disseminated infections like sepsis or tuberculosis.
Explanation of each option: (a) Through the bloodstream – Correct but incomplete. Bloodstream spread is common in systemic infections like septicemia. (b) Through the lymphatic system – Also correct, especially in localized infections that drain into lymph nodes before spreading further. (c) Both (a) and (b) – Correct. This acknowledges that infections can spread via both pathways, depending on the pathogen and site. (d) Neither (a) nor (b) – Incorrect. Almost all systemic infections use one or both of these routes for internal dissemination.