When a person has normal body temperature it is called?

Correct option is A

Afebrile refers to a state of having a normal body temperature, indicating the absence of fever. It is the opposite of febrile, which indicates the presence of fever. Explanation of options:
· (a) ✔ Correct; "afebrile" means without fever.
· (b) ✘ Febrile means having a fever.
· (c) ✘ Pyrexia also refers to a raised body temperature or fever.
· (d) ✘ Hyperpyrexia refers to extremely high body temperature (>41°C).