All are features of heat stroke except:

Correct option is C

Heat stroke is failure of thermoregulation → very high temperature, CNS dysfunction, and hot dry skin due to anhidrosis. Sweating (excessive diaphoresis) is not a feature.
Explanation of options: (a) ✔ Hyperthermia > 40°C is diagnostic of heat stroke. (b) ✔ Altered mental status (confusion, seizures, coma) is key. (c) ✘ Excessive diaphoresis is seen in heat exhaustion, not heat stroke. (d) ✔ Hot, dry skin is typical in heat stroke.