This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology, Subject name: Microbiology
[{'content': 'Calabar swelling is due to - \nSelect and explain. \nA. Hypersensitivity to adult worm of Loa-Loa, B. Hypersensitivity to larva of Loa-Loa, C. Hypersensitivity to adult worm of oncocerca, D. Hypersensitivity to larva of oncerca', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Hypersensitivity to adult worm of Loa-Loa [Ref: Chatterjee 12thIe p. 202}Loiasis* Loiasis is caused by L. Loa (the African eye worm)* Habitat of adult worms is subcutaneous connective tissue of man; often in the sub-conjuctival tissue of the eye.* The worm passes its life cycle in two hosts :# Man# Chrysops (Mango or deer flies)* It causes a characteristic subcutaneous swelling called Calabar (fugitive) swelling. It is due to hypersensitivity reaction to adult worm.", 'role': 'assistant'}]