The cause of larva currens:
Ans. is 'a' i.e., Strongyloides stercoralis(Ref: Harrison, 19th/e, p.1415)* The migrating filariform larva of Strongyloides moves rapidly in a short line at the rate of 3-4 cm in an hour, hence it is termed "larva currens".
Strongyloides stercoralis
Necator americanus
Ankylostoma duodenale
H. nana
Parasitology