Which of the following is a parasitic protozoan?

Amoebic dysentery is caused by

Where does the fertilization of male and female gametocytes of $Plasmodium$ occur?

Male mosquito $(Anopheles)$ does not transmit malarial parasite because

Assertion: There is no chance of malaria to a man on the bite of male $Anopheles$ mosquito.
Reason: It carries a non-virulent strain of $Plasmodium$.

Identify the odd organism out.