A possible answer could be '4 chambers in the human heart'.
The ditloid "24 D in W H C the M" stands for "24 hours in a day, which has a meaning." It references the number of hours in a full day.
13 Hearts in a Pack of Cards.
Four Horsemen of the Apocalypse.
4 Cardinal Points of the Compass
4 Phases of the Moon
4 corners on a tetrahedron.
4 equals H a h s o w a w? WHAT IS THE ANSWER
4 Doors Per Car
4 g in a cc is a ditloid, a type of word puzzle, each letter in the ditloid is the beginning of a word , you have the work it out, in this case the answer is Four Ghosts in a Christmas Carol.
50 Per Cent Equals One-Half
9 C of H in D I? 9 circles of hell in Dante's inferno.
2 Point Four Children