**Core Concept**
Paget's disease is a chronic focal skeletal disorder characterized by abnormal bone remodeling, leading to bone deformities and potential complications. It involves the disorganized and excessive breakdown of bone tissue, followed by its abnormal repair.

**Why the Correct Answer is Right**
Paget's disease is indeed more common in females (d), with a female-to-male ratio of about 1.5:1. The condition typically affects individuals in their 50s and 60s, making option a incorrect as it is common in older adults, not young girls. Elevated alkaline phosphatase (ALP) levels are a hallmark of Paget's disease (b), which is a result of increased osteoblastic activity. However, hypercalcemia and hypophosphatemia (c) are not typical features of Paget's disease; instead, patients may experience hyperphosphatemia. Chondrosarcoma (e) is a rare but possible complication of Paget's disease, but it is not the most characteristic association.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because Paget's disease primarily affects adults, not young girls.
**Option B:** While ALP levels are indeed elevated in Paget's disease, this option is incomplete as it does not provide the context of the association.
**Option C:** Incorrect because hypercalcemia and hypophosphatemia are not typical features of Paget's disease; instead, hyperphosphatemia may occur.
**Option E:** Although chondrosarcoma is a rare complication, it is not the most characteristic association with Paget's disease.

**Clinical Pearl / High-Yield Fact**
Paget's disease can be differentiated from other bone disorders by its characteristic "cotton wool" appearance on radiographs, which is due to the disorganized bone remodeling.

**Correct Answer: D. More common in female.**