What kind of health issue is caused by the large intestinal worm Ascaris lumbricoides?

Ascaris lumbricoides, commonly known as the large roundworm, can lead to a range of health issues for individuals who are infected. This parasitic worm can thrive in the human intestinal tract, where it causes various reactions and complications.

One significant health issue associated with Ascaris lumbricoides is nutritional deficiencies. The worm competes for nutrients within the host's intestines, which can lead to malabsorption and subsequent deficiencies in essential vitamins and minerals.

Additionally, in cases of severe infection, the presence of numerous worms can result in intestinal obstruction. This blockage can cause significant discomfort, pain, and serious complications if not addressed promptly.

Diarrhea is another symptom that can manifest in individuals with an Ascaris infection. The irritation caused by the worm's presence can lead to altered bowel function and gastrointestinal distress, contributing to diarrhea.

Given that Ascaris lumbricoides can cause all of these health issues—nutritional deficiencies, intestinal obstruction, and diarrhea—selecting a choice that encompasses all potential effects of the parasite accurately reflects the breadth of problems associated with this infection. Thus, it is entirely appropriate that the correct answer includes all of the mentioned conditions.