Excel automated random selection

I have table that has repeated timestamps (multiple records within 1 second). there are a variable number of records within each second; ranging from 1 record to 103 records within a second. I wish to develop a method to select only one random record from all the records with the same timestamp.

The Time column is column A. if possible, i would like the end result of the formula (or macro/VBA) to have the word Keep in column B in the row that was randomly selected. all other non-randomly selected rows can be left blank.

thanks and i apologize if my example data table is not formatted correctly.

Time
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:05
7:51:06
7:51:06
7:51:06
7:51:06
7:51:06
7:51:06
7:51:06
7:51:06
7:51:06
7:51:06
7:51:06
7:51:06
7:51:06
7:51:06
7:51:06
7:51:06
7:51:06
7:51:07
7:51:07
7:51:07
7:51:07
7:51:07
7:51:07
7:51:07
7:51:07
7:51:07
7:51:07
7:51:07
7:51:07
7:51:07
7:51:08
7:51:08
7:51:08
7:51:08
7:51:08
7:51:08
7:51:08
7:51:08
7:51:08
7:51:08
7:51:08
7:51:08
7:51:08
7:51:08
7:51:08
7:51:08
7:51:08
7:51:08
7:51:09
7:51:09
7:51:09
7:51:09
7:51:09
7:51:09
7:51:09
7:51:09
7:51:09
7:51:09
7:51:09
7:51:09
7:51:10
7:51:10
7:51:11
7:51:11
7:51:11
7:51:11
7:51:11
7:51:11
7:51:12
7:51:12
7:51:13
7:51:13
7:51:13
7:51:13
7:51:13
7:51:13
7:51:14
7:51:14
7:51:15
7:51:15
7:51:15
7:51:15
7:51:15
7:51:15
7:51:16
7:51:16
7:51:17
7:51:17
7:51:17
7:51:17
7:51:17
7:51:17
7:51:18
7:51:18
7:51:19
7:51:19
7:51:19
7:51:19
7:51:19
7:51:19
7:51:20
7:51:20
7:51:21
7:51:21
7:51:21
7:51:21
7:51:21
7:51:21
7:51:22
7:51:22
7:51:22
7:51:22
7:51:23
7:51:23
7:51:23
7:51:23
7:51:23
7:51:23
7:51:23
7:51:23
7:51:23
7:51:23