MATLAB: How to find the largest region in binary image and replace all other region with black

Question

I have a binary image (attached as 'randomm.jpg') that consists of several shapes.

How to extract the shape with most pixels (white) and replace other figures with black?

Thank you!

Answer 1

bwareafilt() asking to keep 1

https://www.mathworks.com/help/images/ref/bwareafilt.html