Mark the incorrect statement w.r.t. infection of Entamoeba histolytica
It is a protozoan parasite of human
It is characterised by constipation and abdominal pain
It is a parasite in small intestine of man
Houseflies act as mechanical carriers and serve to transmit the parasite from faeces of infected person to food and food products
Sedatives and tranquillisers are often given for treating
Which one of the following disease is sexually transmitted disease
$A$ : It is considered advantageous to give the polio vaccine orally.
$R$ : It prevents reinfection by causing intestinal immunity
Which is a water-borne disease
Which of the following stimulates the heart