**Core Concept**
Rickets is a disease of childhood characterized by softening of the bones due to a deficiency of vitamin D, calcium, or phosphate. This condition leads to abnormal bone development and deformities. Understanding the biochemical and physiological changes in rickets is crucial for diagnosis and management.

**Why the Correct Answer is Right**
In rickets, the increased demand for calcium and phosphate for bone growth and mineralization exceeds the available supply, leading to an increase in bone turnover. As a result, alkaline phosphatase levels rise due to the activation of osteoblasts, which are responsible for bone formation. This enzyme is a key indicator of bone growth and development. On the other hand, acid phosphatase is primarily associated with lysosomal activity and is not directly involved in bone metabolism.

**Why Each Wrong Option is Incorrect**
* **Option A:** Craniotabes is a characteristic feature of rickets, where the softening of the skull bones leads to a soft, depressed, or 'pinched-in' appearance. This is a correct association with rickets.
* **Option C:** Bow legs, also known as genu varum, is a common deformity seen in rickets due to the abnormal growth and development of the long bones. This is a correct association with rickets.
* **Option D:** Increased alkaline phosphatase is indeed seen in rickets, as explained above. This is a correct association with rickets.

**Clinical Pearl / High-Yield Fact**
Rickets is often associated with other conditions such as hypocalcemia, hypophosphatemia, and vitamin D deficiency. A high index of suspicion and early diagnosis are crucial to prevent long-term complications and deformities.

**✓ Correct Answer: B. Increased acid phosphatase. Acid phosphatase is not directly involved in bone metabolism and is not a reliable indicator of rickets.**