**Core Concept**
Chronic acquired dacryocystitis is a condition characterized by inflammation of the lacrimal sac, often resulting from nasolacrimal duct obstruction. The primary goal of surgical intervention is to restore tear drainage and alleviate symptoms.

**Why the Correct Answer is Right**
Dacryocystorhinostomy (DCR) is the preferred surgical procedure for chronic acquired dacryocystitis. This procedure involves creating a new pathway for tear drainage by establishing a direct communication between the lacrimal sac and the nasal cavity. This is achieved through an external incision, allowing for the re-establishment of a functional tear drainage system. The success of DCR lies in its ability to bypass the obstructed nasolacrimal duct, thereby resolving the underlying cause of inflammation.

**Why Each Wrong Option is Incorrect**
**Option B:** Dacryocystectomy involves the complete removal of the lacrimal sac, which may be indicated in certain cases of dacryocystitis but is not the preferred initial treatment for chronic acquired dacryocystitis.

**Option C:** Conjunctivo-cystorhinostomy is a procedure that involves creating a new connection between the conjunctiva and the lacrimal sac, which is not a standard treatment for chronic acquired dacryocystitis.

**Option D:** "None" is incorrect as Dacryocystorhinostomy is indeed a valid surgical option for chronic acquired dacryocystitis.

**Clinical Pearl / High-Yield Fact**
It is essential to note that Dacryocystorhinostomy is typically performed under general anesthesia and may involve the use of a nasal endoscope to facilitate the procedure. This minimally invasive approach reduces the risk of complications and promotes a faster recovery.

**✓ Correct Answer:** A. Dacryocystorhinostomy