**Core Concept**
The question requires knowledge of the calcium content of different types of milk. Calcium is an essential mineral for bone health, and its content can vary significantly across different milk types. Understanding the nutritional composition of various milk sources is crucial for patients with calcium-related disorders or those requiring specific dietary recommendations.

**Why the Correct Answer is Right**
The correct answer is based on the fact that buffalo milk contains a higher concentration of calcium compared to other types of milk. This is due to the higher calcium content in the diet of buffalo, which is primarily composed of calcium-rich grasses. As a result, buffalo milk has a higher calcium content, making it an excellent source of this essential mineral. The calcium content in buffalo milk is approximately 220 mg per 100 ml, which is significantly higher than that of cow's milk (120 mg per 100 ml).

**Why Each Wrong Option is Incorrect**
**Option A:** Cow's milk is a common source of calcium, but its content is lower compared to buffalo milk. Therefore, it is not the correct answer.
**Option B:** Goat's milk has a slightly higher calcium content than cow's milk but is still lower than buffalo milk. Thus, it is not the correct answer.
**Option C:** Human milk has a relatively low calcium content compared to other types of milk, making it an unlikely correct answer.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the calcium content of milk can vary depending on factors such as the breed of the animal, its diet, and the processing methods used. Patients with calcium-related disorders should consult with their healthcare provider to determine the best source of calcium for their specific needs.

**Correct Answer:** D. Buffalo milk contains the maximum amount of calcium.