<human>:  What is the most promising candidate for dark matter?
<bot>: The most promising candidate for dark matter is the WIMP (Weakly Interacting Massive Particle). WIMPs are thought to be the most likely explanation for dark matter, as they are predicted to interact with normal matter only very weakly. WIMPs are also thought to be the most likely explanation for the observed gravitational effects of dark matter, as they are predicted to interact with normal matter only very weakly.