This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cold Chain in India, Subject name: Social & Preventive Medicine
Dial thermometer works on the principle of:- 
Select and explain. 
A. Thermocouple, B. Convection, C. Electromagnetic waves, D. Conduction
A: Thermocouple
Answer: A: Thermocouple 
Explanation: Dial Thermometer:- Principle: Thermocouple Measure ILR temperature twice a day Alcohol stamp thermometer is more sensitive but dial thermometer is more easy to use.