Infection of Ascaris occurs due to
Ascaris lumbricoides is the large and most common roundworm infecting human beings. It is responsible for ascariasis disease. An estimated one-sixth of the human population is infected by Ascaris lumbricoides. The mode of transmission of disease in humans is via the faecal-oral route i.e., when a person consumes food and water contaminated with Ascaris. Eggs released by adult females are shed in faeces. So, the correct answer is 'Contaminated food and water'.