The correct option is C Common cold
The common cold is a viral infectious disease that infects the upper respiratory system. It is the most common viral infectious disease in humans which is caused by coronaviruses or rhinoviruses. Since there are more than 200 viruses that cause the common cold, the human body can never be able to build up the resistance to all of them. This is the reason why colds are so common and often return. So, the correct answer is 'common cold'.