Fifth: the option due to a defect. This is anything that diminishes the value of the item sold, such as illness, the loss of a limb or tooth, or an additional limb or tooth, …

His statement, “Fifth,” means: the fifth of the categories of option.

His statement, “the option due to a defect”: “option” is annexed to “defect.” This is an annexation of a thing to its cause; that is, the option whose cause is the defect. A defect is the opposite of soundness. Thus, one says, “This is defective,” and, “This is sound.” Regarding an animal that is insufficient for the sacrificial offering, one says, “This is defective,” while an animal free of such defects is described as sound. Thus, defect is the opposite of soundness, and what is defective is the opposite of what is sound.

The difference between the option due to a defect and the option due to deception is that a defect is the loss of a quality of completeness, whereas deception is the display of attractive qualities that the item sold does not actually possess.

His statement, “This is anything that diminishes the value of the item sold”: if this item, were it not for this defect, would be worth one thousand, but because of the defect is worth eight hundred, then the value of the item has diminished.

The apparent meaning of the author’s words is that this applies even if the decrease is of the kind that people ordinarily overlook in bargaining; that is, even if the decrease is slight, such as two percent. The apparent meaning of his words is that this is a defect, because he stated it generally: “anything that diminishes.” The word “anything” is a relative noun that conveys generality.

His statement, “anything that diminishes the value of the item sold,” is the governing criterion; what follows are merely examples.

His statement, “such as illness”: even if the illness is slight, because it may develop and worsen. Thus, if an illness is found in the item sold, even if it is slight and reduces its value only minimally, the buyer has the option.