This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment & Nutritional Pathology, Subject name: Pathology
A healthy adult runs a marathon in the summer and develops hot dry skin, cessation of sweating, lactic acidosis, hypocalcemia, and muscle necrosis (rhabdomyolysis). Which of the following is the appropriate diagnosis? 
Select and explain. 
A. Dysautonomia, B. Heat stroke, C. Malignant hyperthermia, D. Myotonic dystrophy
B: Heat stroke
Answer: B: Heat stroke 
Explanation: Exertional heat stroke occurs in healthy men during unusually vigorous exercise, particularly when the ambient temperature is high. Lactic acidosis, hypocalcemia, and rhabdomyolysis may be severe problems. Myoglobinuric acute renal failure is not uncommon. Malignant hyperthermia (choice C) occurs in surgical patients after anesthesia.Diagnosis: Heat stroke