Discussion
Application of ABO grouping in disputed paternity was first used by
Answer: D
The key gives Ottenberg as the person who first applied ABO grouping in disputed paternity, around 1921. I could not check the date against a source, so the key is followed.
Landsteiner discovered the ABO groups in 1901 but did not apply them to paternity. Hirschfeld, with von Dungern, showed that the groups are inherited, a step that made the application possible. Bernstein later gave the three allele theory of ABO inheritance in 1924. These are earlier or later contributions, which the key does not take as the first use in paternity.
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