Final answer:
Pinworm infections, mostly spread through person-to-person contact (option B), are diagnosed via stool sample examination (option C), and the responsible organism is Enterobius vermicularis (option A).
Step-by-step explanation:
Pinworm infections are a common parasitic condition in children. The condition is contracted (B) through person-to-person contact. This happens when eggs from the rectum of an infected individual are transferred to another person's mouth, often through contaminated hands, food, or other objects. A typical diagnostic test for pinworm infections is (C) a stool sample examination, which looks for the presence of pinworm eggs. Finally, the name of the microorganism that causes this condition is (A) Enterobius vermicularis.
Hence, the answers are option B,C and A respectively.