**Core Concept**
Osteogenesis imperfecta (OI) is a genetic disorder characterized by fragile bones, often resulting from mutations in the COL1A1 or COL1A2 genes that encode for type I collagen. This condition leads to impaired bone formation, increased bone fragility, and susceptibility to fractures.

**Why the Correct Answer is Right**
The classic triad of osteogenesis imperfecta includes:
- **Blue sclerae**: Due to the transparency of the sclera, which is a result of the thinning of the scleral collagen.
- **Dentinal hypersensitivity**: Teeth are more prone to decay and may have a bluish tint due to the defective collagen in the dentin.
- **Musculoskeletal deformities**: OI patients often have short stature, joint laxity, and a propensity for fractures, which can lead to musculoskeletal deformities.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because while it may be a symptom of osteogenesis imperfecta, it is not a part of the classic triad.
* **Option B:** This option is incorrect because it is a symptom of other conditions, such as Ehlers-Danlos syndrome, and is not specific to osteogenesis imperfecta.
* **Option C:** This option is incorrect because it is a symptom of other conditions, such as Marfan syndrome, and is not specific to osteogenesis imperfecta.

**Clinical Pearl / High-Yield Fact**
The classic triad of osteogenesis imperfecta (blue sclerae, dentinal hypersensitivity, and musculoskeletal deformities) is the most reliable way to diagnose this condition, especially in infants and young children.

**Correct Answer: C. Blue sclerae, dentinal hypersensitivity, and musculoskeletal deformities**