The question "What is the disease of mum?" is unclear and lacks context. "Mum" is an informal term for mother, so the question is asking about a disease a person's mother has. To answer this question effectively, more information is needed. It is impossible to provide a specific answer without knowing which mother is being referenced and whether the question is misspelling Mumps.
Therefore, I cannot provide a direct answer to the question. If the questioner were to provide which "mum" they are referring to, I would be able to answer correctly.
