**Core Concept**
Breast milk feeding contraindications refer to conditions where breastfeeding is not recommended or may be harmful to the infant. This question tests knowledge of specific situations where breast milk feeding should be avoided.

**Why the Correct Answer is Right**
Domperidone is a dopamine antagonist used to increase milk production in lactating women. However, it is not recommended for use in lactating mothers due to the risk of causing cardiac arrhythmias in infants exposed to the drug through breast milk. This is because domperidone is a substrate of the P-glycoprotein and is extensively metabolized in the gut, but a small amount is absorbed systemically and can be excreted into breast milk. Infants exposed to this drug may experience cardiac effects, including QT prolongation and arrhythmias.

**Why Each Wrong Option is Incorrect**
**Option A:** A mother being sputum negative is actually a consideration for breastfeeding, as it indicates the mother is not infectious with tuberculosis or other respiratory pathogens. This is a situation where breastfeeding may even be beneficial for the infant's immunity.
**Option B:** Bromocriptine therapy for the mother is not typically contraindicated with breastfeeding. In fact, bromocriptine is used to suppress prolactin levels in women with hyperprolactinemia, which can help with galactorrhea or gynecomastia.
**Option C:** Heavy breast engorgement is a common issue in lactating women but is not typically a contraindication to breastfeeding. In fact, breastfeeding can help alleviate engorgement symptoms.
**Option D:** While Ca Breast is a contraindication to breastfeeding due to the risk of transmitting cancer cells to the infant, this option is not the best answer because it is not the most specific contraindication listed in the options.

**Clinical Pearl / High-Yield Fact**
When considering medications for lactating women, it's essential to review the medication's safety profile in breastfed infants. The American Academy of Pediatrics (AAP) provides guidelines for medications that are safe to use during breastfeeding.

**Correct Answer: E. Mother on domperidone**