The infective stage of Entamoeba histolytica is

Correct option is B

The correct answer is (b) mature cyst

Explanation:
• Entamoeba histolytica is a severe human protozoan parasite responsible for causing amoebiasis (amoebic dysentery).
• The infective stage for a healthy human host is strictly the mature quadrinucleate cyst, which is heavily resistant to environmental degradation and stomach acidity.

Information Booster:
• Transmission primarily occurs via the fecal-oral route, usually through the consumption of food or water contaminated with these mature cysts.
• Once inside the small intestine, the cyst undergoes excystation, eventually releasing active trophozoites that migrate to and colonize the large intestine.

Additional Knowledge:
trophic form (Option a)
• The trophozoite is the active, feeding, and motile stage that causes actual tissue damage in the host, but it cannot survive outside the body to infect others.
sporozoite (Option c)
• The sporozoite is the infectious stage of the malaria parasite (Plasmodium), which is transmitted by the bite of an infected Anopheles mosquito.
minuta form (Option d)
• The minuta form refers to a pre-cystic or non-pathogenic luminal stage of E. histolytica that prepares to encyst.
None of the above/More than one of the above (Option e)
• Incorrect, as mature cyst precisely identifies the transmission vehicle.

So the correct answer is (b)