Paternity disputes could be resolved accurately through

Analyze the question: It asks which method can settle a paternity dispute (deciding who a child's biological father is) accurately.

Explain the concept: A child inherits half of their DNA from the father and half from the mother. DNA is unique to each individual (except identical twins). By comparing a child's DNA with the alleged father's DNA, scientists can check whether the child's genetic markers match those that could only have come from him. This is called DNA profiling (or DNA fingerprinting). The match is close to 99.9% accurate.

Solution: checking each option

• A. Fingerprinting: Ordinary fingerprints (the ridge patterns on fingertips) are used to identify individuals, for example at crime scenes. They are not reliably inherited in a way that proves parentage, so this is not suitable. Note that this is different from DNA fingerprinting.
• B. Tongue rolling: This is a simple inherited trait, but many people share it, so it cannot identify a specific father.
• C. DNA test: The child's DNA is a combination of the parents' DNA, so matching DNA profiles give an accurate and reliable result. ✔
• D. Blood group: Blood groups can only exclude a man (for example, a child with blood group AB cannot have a parent with group O). However, many men share the same blood group, so it cannot positively prove paternity.

Answer: The correct option is **C.

Exam tip: Remember "DNA = Does Name Accurately": whenever a question asks about accurate identification of parentage or criminals, think DNA. Blood group only excludes, while DNA confirms.