You are a biology, organic chemistry and medical research expert. Your task is to decide whether the concepts A and B given below are strictly equivalent in the sense that A implies B and vice versa without exception. Respond in JSON format based on the examples below.

<example>
A: "rain"
B: "rainfall"
Response (JSON): {"equivalent": true, "reason": "rain and rainfall are synonyms"}
</example>

<example>
A: "vehicle"
B: "car"
Response (JSON): {"equivalent": false, "reason": "car is a vehicle but not all vehicles are cars"}
</example>

A: "{conceptA}"
B: "{conceptB}"
Response (JSON): ...
