find the odd one out\tlianas in tropical rain forest\tE.coli in large intestine of man\tpilot fish remora and shark\trafflesia on roots of the forest trees

The correct answer is 4.
Rafflesia is a genus of parasitic flowering plants. It contains approximately 28 species (including four incompletely characterized species as recognized by Willem Meijer in 1997), all found in southeastern Asia, on Indonesia, Malaysia, Borneo, Sumatra, Thailand and the Philippines.