Task: Please answer the multiple choice question.
Question: Which molecule has the highest Caco-2 cell permeability?
Constraint: Even if you are uncertain, you must pick either a, b, c, or d without using any other words.
Options:
[a] C=C(c1ccccc1)C1OCC(NC(=O)Cc2ccccc2)CO1
[b] CCCCOC(=O)c1ccc(O)cc1
[c] CNC(=O)[C@@H](Cc1ccccc1)NC(=O)[C@H](NC(C)=O)C(C)C
[d] NC(=O)Cc1cc(/N=N/c2ccc(S(=O)(=O)Nc3ccccn3)cc2)ccc1O
Answer: b
Task: Please answer the multiple choice question.
Question: Which molecule has the highest {permeability__names__noun}?
Constraint: Even if you are {#uncertain|not sure!}, you must pick either {%multiple_choice_enum%2-5%aA1} without using any {#other|additional!} words.
Options:
{SMILES%permeability%}
Answer: {%multiple_choice_result}