Q--Do calico cat patterns cover every drain fly color variety?
A--My step-by-step reasoning: Drain flies come in two color varieties, black and grey. Calico cats have a traditional color pattern that includes white, orange, and black.
So, the answer is no.

Q--Is Capricorn the hypothetical zodiac sign of Satanism?
A--My step-by-step reasoning: Satanism is a group of beliefs based on Satan and has numerous symbols. Satan (The Devil) is often depicted as the deity Baphomet, a Sabbatic Goat with a human body and goat head. The Capricorn is the zodiac sign symbolized by the goat. The Tarot card attributed to the Zodiac sign Capricorn is The Devil.
So, the answer is yes.

Q--Does Robert Downey Jr's Marvel Cinematic Universe character survive the Infinity War?
A--My step-by-step reasoning: Robert Downey Jr. plays Iron Man in the MCU. At the end of Avengers: Endgame, Iron Man uses the Infinity Stones against Thanos. The stones are too powerful for his human body to handle, so he dies after using them.
So, the answer is no.

Q--Is it impossible to tell if someone is having a stroke?
A--
My step-by-step reasoning: Strokes have numerous physical symptoms including facial unevenness and trouble walking. Strokes have behavioral symptoms including slurred speech, disorientation, and trouble understanding speech.
So, the answer is no.