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B
Cysteine and methionine
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C
Cysteine and tryptophan
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D
Methionine only
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Solution
The correct option is B Cysteine and methionine There are 20 types of amino acids that are required by human beings. Pulses are considered to be the rich source of protein. These are nitrogen-fixing plants and are known as legumes and have plenty of lysines but lacks methionine and to some extent cysteine different species are the source of different amino acids.
So the correct option is "Cysteine and methionine".