This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
A person working in hot and humid environment consuming lots of plain water without salts is likely to have: 
Select and explain. 
A. Heat stroke, B. Heat exhaustion, C. Heat syncope, D. Heat cramps
D: Heat cramps
Answer: D: Heat cramps 
Explanation: Heat cramps occur when a person is doing heavy muscular work in high temperature and humidity. There is painful and spasmodic contraction of muscles. It is believed to be due to losses of sodium and chloride in sweat. Ref: Park 21st edition page: 690.