Which virus is responsible for the common cold?

$A$ doctor identifies symptoms of nasal congestion,headache,sore throat,hoarseness,and cough in a patient. The conclusion is that the patient is infected by which pathogen?

In the common cold,which of the following organs experiences fluid discharge?

Which of the following is $NOT$ a symptom of the common cold?

In which of the following is the 'fibrous knot disease' (or 'bunchy top'/'witches' broom' type symptoms) observed?

'Polio' is caused by