TASK DEFINITION: You are given a science question (hard-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.
PROBLEM: Which of the following animals is an invertebrate?  
 (A) Squirrel (B) Sea gull (C) Cricket (D) Lizard

SOLUTION: C

PROBLEM: Which of these is never found in prokaryotic cells?  
 (A) cell membrane (B) ribosome (C) cell wall (D) nucleus

SOLUTION: D

PROBLEM: Which of these is not an inherited trait in humans?  
 (A) height (B) hair color (C) skin color (D) intelligence

SOLUTION:
D

