This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'Which of the following can be found in ocular muscles? \nSelect and explain. \nA. Trichinella, B. Ascaris, C. Enterobius, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Trichinella spiralis\n→ It is a parasite of pig. Man is an incidental host.\n→\xa0Infective form is encysted 1st stage larva which is transmitted by eating uncooked pork.\n→\xa0Larva penetrates intestine and migrates to muscles where it undergoes encystation.\n→\xa0Most commonly involved muscles are extraocular muscles followed by biceps and muscles of jaw and neck.\n→\xa0Most infections are asymptomatic.\n→\xa0Clinical manifestations\xa0may be:\n\nAbdominal - Diarrhea or constipation, abdominal pain, nausea, vomiting.\nHypersensitivity reaction - Fever with eosinophilia, periorbital and facial edema, hemorrhages in the subconjunctiva, retina and nail beds (splinter hemorrhages).\nRarely - Myocarditis with heart failure, encephalitis, pneumonitis.\nSymptoms due to encystment of larva in muscles - Myositis with myalgia, weakness.\n\n→ Bachman intradermal test is used for Trichinella.\nEducational point\nThe muscles most often invaded by Trichinella are highly vascularized muscles, such as eye muscles tongue, deltoid, pectoral, intercostal, diaphragm and gastrocnemius.', 'role': 'assistant'}]